The info Diane requested will be helpful to answer a lot of questions I have. Namely any history of ketones, other health issues, other medications, and what his diet is. Also how he was diagnosed.
Your dosing is kind of all over the place, I'd suggest reading through the dosing methods we have here:
https://www.felinediabetes.com/FDMB/threads/prozinc-dosing-methods.225629/
Once you choose one we can better help you. You likely should have reduced after that 65 a little bit ago rather than gone up. Dose is based on nadirs, or how low the cat goes, not preshot.
It looks like he's hitting the lows and bouncing back up. This is pretty normal, although without some more midcycle tests it's a bit hard to see if it's partially because the dose is too high, or if the food carb content isn't ideal.
Can you to try to get a few more +6, +7, and +8 tests? That seems to be about where Mikey's nadir is.