That is a colorful spreadsheet! 1.5 clearly seems too high of a dose. There were times when the cycle lasted too long and you had to skip. So, I like 1.25 better. I don't know what was going on today - it was certainly high and flat which can be too much insulin or bouncing from the previous cycle.
If he were mine, I would shoot 1.25 for a few cycles (unless you get any preshoot numbers in the lower ranges). Anytime you can, get some midcycle numbers - especially at night since that seems to be the cycle that results in the higher amps. Let's see if he settles into the dose and the bouncing stops.
You are feeding Fancy Feast classic, right? No way to get into higher carb? He has no other issues - infections, bad teeth etc?