First of all, I would like to thank you, Katiesmom, Hillary & Maui and Wendy & Tiggy, for responding to my post. I really appreciate any help that I can get, so thank you again. I apologize for posting with a "911" icon. I guess, to me, it feels like an emergency, but I understand that, in the scheme of things, this doesn't constitute as an emergency. In truth, I am not experienced posting on forums, this being only my second or third time in my entire 40 years of living

I am going to attempt to answer the questions that you asked as best I can, and I apologize in advance for the length of this post. I just want to be thorough.
1. Corduroy's situation: Corduroy is a 15-year-old Maine Coon, who happens to be diabetic. He weighs, on average, about 10.5 lbs. He seems to be quite healthy, other than his diabetes, chasing after our red laser light, grooming himself, wanting to go outside on his leash, etc. He has shown symptoms of neuropathy, however, in that when he is eating his food, his back legs want to splay out a bit. This has been going on since his first episode of diabetes. He has also had quite a few dental issues in the past, having had a canine tooth pulled, as well as a few teeth in the back of his mouth due to reabsorption. I should add, that when checked for ketones in his urine, the vet found none. The last check was on June 6, 2013.
2. Insulin type: Lantus Solostar (glargine).
3. Dosage: When first diagnosed during the summer of 2012, we varied between two and three units twice a day (12 hours between each dose). Soon, we found three units to be too much, and slowly, he kept needing less and less until he went into remission for about a year. At this time, I was also feeding him Hill's Prescription Diet m/d canned food, prescribed by our vet, with whom I kept in close contact. When he went into remission, because I had been researching to find the best canned cat food out there that I could afford, I switched him to Wellness. This is what I fed him for the year that he was in remission. However, this past spring, I noticed that he was urinating a lot again, looking scrawny and not grooming himself. So I checked his BG levels, and sure enough, they were high again. This is when, along with consultation from our vet, I started administering Lantus again, as well as going back to feeding him m/d. I felt terrible because I assumed (and still do assume) that feeding him Wellness caused his diabetes to come back.
Since then, Ive been feeding him m/d and giving him Lantus. This second time around, however, I started out giving him two units, and never had to give him three again, as giving him three units before seemed to make his BG levels go too low. I have kept a log the entire time. Here's what a typical three days looked like when his second bout with diabetes began (again, I apologize for the length of this reply, but want to give you the information you asked for):
4/26/13
6:11 am - 385 - 2 units
10:51 am - 258 - 0 units
1:08 pm - 328 - 2 units
4:36 pm - 331 - 0 units
8:05 pm - 235 - 1 unit
10:53 pm - 186 - 0 units
11:58 pm - 176 - 0 units
4/27/13
7:09 am - 415 - 2 units
9:12 am - 394 - 0 units
12:00 pm - 387 - 2 units
4:54 pm - 64 - 0 units
6:05 pm - 61 - 0 units
8:54 pm - 76 - 0 units
(at this time, he was not showing any signs of hypoglycemia)
4/28/13
12:07 am - 248 - 0 units
7:13 am - 547 - 2 units
12:14 pm - 294 - 0 units
7:02 pm - 337 - 2 units
9:36 pm - 432 - 0 units
11:46 pm - 328 - 0 units
Recently, before starting him on raw food, while he was still on m/d, it looked like this:
8/18/13
9:21 am - 183 - 0 units
2:43 pm - 125 - 0 units
7:14 pm - 154 - 0 units
10:41 pm - 237 - 0 units
8/19/13
8:07 am - 392 - 1 unit
8:19 pm - 145 - 0 units
11:58 pm - 204 - 0 units
Now, since feeding him Feline's Pride Raw Made Easy Kit 1, mixed with turkey thigh and breast, half and half, it looks like this:
8/27/13
8:41 am - 214 - 0 units
12:14 pm - 227 - 0 units
6:43 pm - 381 - 1 unit
11:07 pm - 67 - 0 units (This is when he was unresponsive. When I finally woke him up, he was walking around as if he were drunk, very wobbly. I know that a BG level of 67 wouldn't normally put him in the hypo range, but he definitely was. I had to give him Karo syrup twice, along with some m/d canned food that I had saved from before)
8/28/13
12:09 am - 124 - 0 units
1:26 am - 90 - 0 units
3:55 am - 150 - 0 units
9:26 am - 431 - 0 units (I am now a bit trepidatious to give him even one unit)
1:07 pm - 453 - 0 units
2:33 pm - 450 - 1 unit
10:17 pm - 389 - 0 units
8/29/13
12:30 am - 441 - 0 units
4:11 am - 435 - 0 units
8:09 am - 492 - 1 unit
12:07 pm - 352 - 0 units
9:56 pm - 254 - 0 units
11:44 pm - 204 - 0 units
8/30/13
9:13 am - 460 - 1 unit
11:33 am - 318 - 0 units
As you can see, I've been checking him a lot to see if I can make sense out of his numbers. I've also just learned about the Somogyi Effect, in which the body's natural defenses go into effect, causing falsely high BG levels due to a quick onset of hypoglycemia. In this case, as you all probably know, I would need to give him less insulin, even when his BG levels are high.
I realize that his levels are high, which is definitely not good, but with the consideration of the possible Somogyi Effect, along with the fear that he will have another hypo episode, I have been very cautious in giving him even one unit.
4. How old is the insulin?: The insulin is from when he was first diagnosed in the summer of 2012. Currently, we are still using the same pen that we started with. On the side, it says that it expires in October 2014. The other pens that came in the package have been stored in the refrigerator the entire time, as instructed by our vet.
5. What kind of meter?: We are using a Bayer Contour meter along with the Contour test strips.
6. Bouncing: Wendy, in reference to this, from what you wrote, it seems that this mainly happens upon first being diagnosed. Do you know if this can this happen while transitioning to a new, next-to-nothing-carb food as well?
Lastly, you all might be wondering why I changed his food at all, due to his levels being pretty good while on m/d. In answer to this, I changed to Feline's Pride raw food because I have been reading Dr. Lisa Pierson's website. On this, she mentioned Feline's Pride as being one of the best raw foods out there, in addition to a raw food diet being better for diabetic cats in general. She also mentioned that most all commercial cat foods, prescription ones included, have a very high carbohydrate content, which exacerbates feline diabetes. However, I am thinking about going back to feeding him m/d because I don't want his levels to stay high for fear of permanent damage to his kidneys.
Thank you in advance for reading this long post, and I really appreciate the replies that I have already received
Sincerely,
Brigitte