I know what you're going though - it's just like the first few times I saw blue, and even green. Your first instinct is to reduce. Mine was too. I've delayed, I've dropped, and it took many days, even weeks, to make up for lost ground.
On ProZinc, last January 13 to May 31, my "do not shoot" number was 250. Most of the time, that wasn't an issue, as his numbers rarely moved out of the pinks. But even my vet, when we were reviewing his spreadsheet, commented that many of the times I didn't shoot, that it would've been safe to do so.
I've always tried to err on the side of caution, and usually recommend others do the same too.
In reviewing your SS, it wasn't until you got to 1.4 that you saw blue. Not scary blue, but nice blues. But it looks like you shot reds by +13 (be sure not to "reset" your numbers until you shoot). Based on what my vet told me, and now with a little over a year under my belt, I am more willing to shoot lower numbers. But Grayson has another condition, so I've had to learn to do this.
I would be inclined to hold the dose. Look how quickly he climbed between +12 and +13. Seems like the insulin is completely out of the body in 13 hrs. You've got a good amt of data, and IMHO enough to maybe adjust down your "do not shoot" number. Or perhaps Robin can suggest a sliding scale... something like 1.4 over 250, and 1.2 200-249, and 1.0 @ 150-199. That way, your kitty wouldn't spike so much at the end.
I've learned I can't skip a shot. I can either reduce or delay if he's really low. Some people can do both. I can't. But these are decisions that you have to test and see what works best for YOUR kitty.
Lu-Ann