Hello again. I took a peek at your spreadsheet. It looks like testing is getting easier for you, which is very good. It's always best to have a test before each shot.
Here's what we find works best for me and my kitty. Shots evenly spaced, 12 hours is best starting out. PZI and ProZinc are reputed to be more flexible with timing, but I'd suggest sticking to a 12/12 schedule as much as reasonably possibly for a while. I test, feed, then shoot (assuming a shootable number). Test, food, shot -- in that order -- all within just a few minutes of each other. On a 12/12 schedule I will usually give a small snack around the time of onset, usually at +2, but I'm less strict about that.
Double lock up the dry dog food, cheerios, whatever. Hungry cats are sneaky and persistent. And will eat stuff that make you go, huh? cats don't like that. Unregulated cats are often hungry cats. It's ok to feed them more. Adding water to the wet food can also help fill them up, and extra water is good for them.
If you have switched from dry cat food to low carb wet food within a couple of weeks or so, insulin demand can decrease suddenly. Testing will help you determine when/if this happens.
Fur shots happen. When my kitty is squirmy, we're more likely to have them. When Buddha is not cooperating I have someone scritch him under the chin. Usually distracts him and he doesn't notice the shot. I've also heard the advice, be sure to push down on the plunger, do not pull up on the barrel.