Hi. Sorry you didn't get a response sooner. Late at night, it might be a good idea to post here but also put a link to the post in Health because that definitely does get more traffic.
I see you decided to give Simon 1.75u tonight. There is no set formula like give x amount of insulin at a reading of y. The dose is very much dependent on the cat. I agree however that the dosing your vet advised was high and reducing was the right decision. The only way to figure out how much insulin to give is to start with a low dose, usually of no more than 1unit and work up from there so you don't bypass the right dose. Once you have more data, it will be easier to see how the insulin is working for Simon and in turn to determine what dose to give him based on pre-shot test numbers.
You have missed a number of doses lately due to low enough pre-shot tests that giving insulin was not advisable. If I were you, I think I'd take Simon down to no more than 1u and then work up from there. If you can get some more tests in around +3/+4 to try to find his nadir (lowest point in the 12 hour cycle) and +7/+8 to see what he is doing later in the cycle, it will give you the data you need to make dosing decisions. The goal is to find a dose that you can give twice daily that keeps Simon in decent BG ranges without sending him too low or having him run too high.
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