Hi Brandi - hope the the latter part of summer treated you and Taco well. Taco seems to have turned a little corner in his numbers.

Yes, I'd try the 0.5 unit decrease, and see how it goes. If it doesn't work, next time you might try 0.25 units. With larger dose cat, you really do have to experiment to see what works for them. With Neko, depending on whether she was otherwise stable on her dose, or doing a big down dose slide, I'd chose a smaller or larger decrease.
Can't remember if I've mentioned it to you, but on cats that get over 6 units, we suggest that caregivers think about getting test done for a couple secondary conditions that can mean the cat needs higher doses. Specifically, IAA and acromegaly. My Neko had both conditions. One in four diabetic cats has acromegly, which is caused by a benign pituitary tumour that sends our excess growth hormone which in turn causes the diabetes. IAA is sort of like an allergy to the injected insulin. The tests for both conditions are blood tests that are sent to the same place, Michigan State University. Note, some cats with these conditions have lower doses, which is one of the reasons I hate the term high dose conditions, but typically a cat over 6 units has a secondary condition of some kind causing the need for more insulin.
How is Taco doing overall?