Hi Marcy -
You've been at this a while, but I didn't see on your spreadsheet when you started on Lev. Initially I was a little reluctant to switch from ProZinc because I knew the L insulins were not going to be as flexible - and my schedule can be pretty crazy sometimes. Depending on your schedule, it can be difficult to shoot at the same time every day. For me, the 6:30 am/pm is the time I'm most able to catch. I try not to veer off that schedule by more than 15 minutes per cycle.
I'm curious - are you shooting the number, so it doesn't climb? Or is your schedule such that you're unable to shoot consistently? Is there another time that would work better for your schedule? I know Libby & Doug shoot Hershey at 2 or 3 am/pm. I know I could NEVER keep that schedule, but it works because of Doug's job. It also gives them the opportunity to get a fair amount of sleep before the onset (and in his case, catch any lows).
Grayson has Acromegaly and Insulin Resistance (IAA) - conditions that mean extreme high doses. But for the most part, I've seen him come down from a 50 pt range starting at 450 on PZI, to 100+ point ranges starting primarily at 300-325. In order get a clear picture of his response, it's important to keep as many of the variables that we can control, as consistent as possible, including the length of the cycle. That allows you to see their patterns and be able to make the best decisions possible for their treatment.
I"m still doing increases, so I've got zero experience with reductions. It might be helpful to look over some others' spreadsheets to see how they handled similar numbers. After all, that's part of why we do them, right?
Good luck,
Lu-Ann