Hi Titan's Dad (do you have a name you are willing to give?). Did you get the IAA (insulin auto antibody) test done too. Quite a few acros, like my girl, are positive for both. It can have an impact on how we do dosing. Sorry about the diagnosis, but as you said, now you know what you are dealing with. Knowledge is power.
It looks like your spreadsheet isn't up to date with today's readings. It's too bad you went down in dose a few weeks ago. I'm pretty sure he'll have to go higher than he was before. If nothing else,
glucose toxicity will have set in. If you were willing and able to test more frequently, we could probably fast track Titan's dose, but as is, you need to get at least a preshot test every AM and PM plus some tests somewhere in the middle of the cycles, if you are going to go up every six cycles. Are you testing regularly for ketones? You should while he is in those high numbers.
For dosing advice, most of us still post to the Lantus/Levemir group. Which brings up one other topic. At some point, you may or may not find that Titan reacts to his shots. Lantus has an acid base, and at higher doses it can sting. Not all cats react, but some do. If that happens, you may want to consider a switch to Levemir insulin.