The amount seems right to me, but I'm not a vet. If he keeps on that schedule, he should drop a few pounds and need less insulin.

Can you switch the treat to something with less preservatives? Bear and two of my other dogs like baby carrots, but Bella won't touch them so she gets a small biscuit. It's tough when you have more fur kids to feed.

I'll be anxious to hear the result of the further tests. Looks like you're on the right path.

(Is it getting any easier yet?)

Mary