That was a large drop this morning, so it was good to do what you did and get another test later.
The dry food can increase blood sugar by literally hundreds of points. We've had people see their cat get as few as 3 pieces of dry crunchies and that resulted in high numbers for the next day. Just depends on how carb sensitive a particular cat is.
When we're thinking about dosing, we're looking at answering the question "how low does this dose make this cat go?" In Pimp's case, he's at least getting to 158 on it when he's not getting dry. Does he like canned food? If there is any way to get him to transition to it, you'll be amazed at how much less insulin he will need to get controlled. It's not uncommon for newly diagnosed cats to work off of insulin with a switch to canned low carb and a little bit of insulin support. We don't know which cats can do that and which can't, but it does happen fairly regularly.
I have 3 cats (no diabetics as Punkin has passed away) and I feed all of them low carb canned. They have to eat in 3 separate rooms because there's one that would eat everyone else's. I put one in the laundry room, one outside the laundry room door, and one in a bedroom. Wait about 10 minutes and open up the doors. If you have a hard-core kibble addict, you could try a system like that. We're used to it and it's become no big deal at all.
Has anyone given you the link to
www.catinfo.org yet? It's run by a vet and she has a lot to say about appropriate food for cats. She also has a section on how to transition dry food addicts to canned food.
Dropping back to 1 unit when the new food arrives may be a bit much but lets wait and see. Post that question again when you're ready to make the swap and we'll see where he's at - it's near on impossible to plan too far in advance with FD
I agree completely with Serryn (Vyktor's mum) about making changes when the new food comes. Usually people make small changes anyway so as not to upset the cat's stomach. I think there are some guidelines on that on the catinfo site as well. If you adjust the food slowly, you'll be able to adjust the insulin dose as it's needed as well.
and welcome to Lantus/Lev Land! Glad to have you and Pimp here!