It'll really help if you'll add some information into your signature as well as start our spreadsheet program to keep track of his test numbers. If you look below in our signature line you'll see lots of information that I'd need to ask you about anyway before responding, like what food he's eating, what insulin he's on, when he was diagnosed, when he was started on insulin, etc.
Our spreadsheet program is also a VERY valuable tool no matter which insulin you're using. It helps us to identify the patterns we're looking for when making suggestions on dose increases. Here's some instructions on
"How to create our spreadsheet" but if you have trouble with it, let us know. Someone can set it up for you and then transfer it to you
As for furshots, it sounds like you might have shot Bubba again after you thought you gave the furshot? Don't ever do that since there's no way to know how much might have actually gotten in. We've seen it happen 1000 times when someone was sure they gave a furshot, and later in the cycle, their cat earned a reduction in dose so don't ever assume they didn't get the whole shot.
The sad fact about your vet is that he's like pretty much every other vet out there...he's not up to date on the latest treatment for feline diabetes. It may not really be his fault though....Vets just don't have the time to stay up to date on the latest treatments for every disease in every type of animal they see. If they tried, they'd never have time to actually see patients! Another very sad fact is that they get less than a day's worth of teaching in nutrition in school, so most of the "continuing education" they get is from Hills food salesmen (who of course are going to tell them how great their food is so they'll buy more...and the vet then pushes it on his clients because he believes what he's told....and makes a nice profit on it too!)
Most of us don't see our vets for anything other than routine checkups/vaccinations and when there's something new that needs to be diagnosed. We listen to the people here on dose increases/reductions because the people here have more real life experience with diabetic cats than any vet out there. Most vets won't see a handful of diabetic cats in their entire career. The advice of the people here on this message board has saved many cats lives, as well as getting them as healthy as possible ...and we've had a lot of kitties go OTJ too!! (OTJ=Off The Juice)