brittini and sandy, those are great numbers. you're doing just super with this.
if he's still in numbers like this by the weekend, you could decrease the dose even further and see if he holds these numbers. just fyi, a vet would have you just go off of insulin at this point . . . my point being if you want to do that it's an option. i would keep it up a few more days to give his pancreas support, but there is more than 1 way to do this.
always what you are watching for is to keep him above 50 - and mid-cycle is when he will go the lowest. 40's are that safety zone that means you need to take action and bump him back up into the 50's with high carb food (gravy) or a dime sized bit of karo syrup. if you can't check him during the day from +4-+6, i'd leave him a snack of low carb food just before that so he can eat if he needs it. check when you leave and as soon as you walk back in the door. also, many, many cats have lower numbers at night for some reason, so you could try getting a +5 or so at night.
i'll keep watching for your posts. i'm back at work and gone during the school day, so won't be able to answer about how low is ok to shoot in the mornings. i don't think you should shoot less than 100, maybe even not less than 120, i'm ambiguous about it - i guess it depends on if you're around to monitor. for sure, if you see less than a 100 in your preshot blood test, just skip the shot and let's see how he does. non-diabetic cats run 40-120ish.
at the point you are at, i'd rather see you skip a shot if you have any doubts. always, always, safety comes first. we'd rather see a cat be too high for days than too low for a minute. felix needs to be monitored during that mid-cycle time.
you are so close i can smell it! :lol:

pat yourselves on the back - you're so incredibly lucky!
and just fyi - once he goes off of insulin you must consider he is still diabetic, just diet-controlled. for the first 2 weeks off of insulin, check his BG a couple of times a day - it's easy to continue to check about the same times you were giving shots before. after 2 weeks, check him about 1/week for another month, then you can skip to checking about 1/month. most people continue checking once a month.
a diet-controlled diabetic cat can need to resume insulin if they have an infection or illness, or if they need their teeth cleaned. if you start seeing diabetic symptoms again - excessive thirst and urination, etc., then test him to see if he's still ok.
thoughts? questions? how are you doing tonight?