Hi and welcome. I would suggest you set up your spreadsheet and signature so we can help you.
There is no conversion from one insulin to another, but when swapping over, depending on what the BG data has been, the dose usually remains similar or slightly lower.
Once you set up the spreadsheet and we can see the data, we can guide you on increasing the dose but until then we can’t. It would not be safe.
Is your kitty eating well and not lethargic? It’s very important that he is eating well.
Have you been testing for ketones in the urine? If not I would recommend you buy some Ketostix from Walmart or a pharmacy and collect a urine sample and test the urine for ketones…..we don’t want to see any ketones.
When you reduce the dose of insulin quite a bit, or stop it with a diabetic cat suddenly, there is a risk of ketones forming. So checking for them is a wise move.
Keep asking questions.