let me suggest something that might help his BGs come down.
I'm going to disagree a little with Chris on this. I wouldn't feed after midcycle. Jake may protest at first, but he will eventually adjust. Punkin was a big boy too, and I fed him one can of Ff at preshot and 1/2 can at +3, then I gave him boiled chicken breast cut into 1/2" cubes for post-poking treats.
When you feed after midcycle, the insulin's strength is waning and it can be just like putting the brakes on its effect. If Jake were a delicate little girl that nibbled here and there, that would be different. But you're talking about quite a bit of food that is coming into his body when the insulin isn't as potent.
If I'm reading you right, he is eating 3.5 cans a day
amps 1 can
am+4 0.5 can
am+8 0.5 can
pmps 0.5 can
pm +4 1 can
I'd continue giving him the same amount of food, just tweak when he gets it.
amps 1 can
am +3 0.5 can
am +4 or 5 0.25 can (1/4 can)
pmps 1 can
pmps +3 0.5 can
pm +4 or 5 0.25can
This schedule will put all of the food in the first half of the cycle and hopefully help his numbers come down. Most diabetic cats who have high numbers are starving, literally. When a cat eats, the nutrient that is used by the cells is glucose. When all is working right, the glucose gets into the cells and the cat feels fed. Right now, the glucose floating about in his body is nutrition that he's not getting - he is hungry! But as his numbers come down he won't be as hungry. I think tweaking his feeding times will help his numbers come down. The timing of when a diabetic cat eats can really make a difference, and Jake's getting some good numbers on the 2.0u - that 107 is great. Hopefully this will help him spend more time in good numbers.
Punkin had acromegaly, which makes a cat diabetic, and makes the cat even more starving than the usual diabetic cat. we joked that we had a "Feed Me Contract" and punkin didn't like it when there were any deviations from The Contract. But he did adjust to changes, and he actually went from +3 to ps every cycle without more food, except when we were bringing up low numbers. Jake will adjust to a change and it is likely to help him feel better as his BGs come down.
What do you think? Do you want to give it a try? If he gives you unrelenting grief and you can't stand it, just give him one teaspoon watered down at +8 to help him adjust. Here's a post that talks about the hunger an unregulated cat feels and feeding them:
Feed Kitty as Much as They Want?