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It sounds like Hardey forgave you for the ear poke! One of the best ways to get any kitty to adjust to the poking is treats. Freeze dried chicken is very popular as a low carb treat. Feeding cooked chicken or anything that is zero carbs works fine. My guys are also fond of Wellness jerky-style treats. Any time you test, whether it's a successful test or not, Hardey gets a treat. You're getting him to associate the pokes with something he likes. You'll read about kitties that go running to their testing place and wait for a test because they know treats are involved.
Since he has been on 2 units twice a day for a month, is it bad for him to not have any at all even with his numbers on the low side? Will it hurt his pancreas to stop "cold turkey"?
Given where Hardey's numbers are sitting without insulin, I tend to think that 2u would cause his numbers to tank. It would be worse for his health if he were getting too much insulin.
I think if you could get Hardey off of the Science Diet dry food, you'd see even greener numbers. I'm not sure which Science Diet is for liver issues but their foods tend to be very high in carbs and made from poor ingredients. Is Hardey getting any supplements (e.g., Denamarin) for liver issues? Is there any way you can fully ween him off of the dry?
It also sounds like your vet is suggesting far less food than Hardey needs. There is a formula for calculating the number of calories a cat needs per day:
Required calories per day = [13.6 X optimal lean body weight in pounds] + 70
If 18 lbs is Hardey's ideal weight, he should be getting roughly 315 calories per day. The formula is generous so you may need to adjust the amount of food. You may also find that by putting Hardey on a canned food diet, he'll start to lose weight.
At this point, you don't have to be testing frequently. Since Hardey isn't getting any insulin, there's no worry about his numbers dropping too low. I'd suggest getting a test before or close to mid-cycle and one at around +9 (give or take).