Welcome!
I would say, having read the notes on your spreadsheet, that since you just started the new Lantus pen yesterday, it is entirely possible that the previous pen had lost some of its effectiveness. Jibbit seems to be working on clearing a bounce from the low number (and then missed shot) a couple of days ago, and Sunshine looks to have earned a reduction.
I am concerned about one thing though... you have made quite a few dose changes in a short period of time but you dont have much data during the middle of the 12 hour cycle. (+6 to +8 time frame) Somewhere near there is when the cat will hits its lowest point in the cycle, called the nadir. That is the number we base dose changes on, not the pre-shot. The pre-shot number is what tells you if it is safe to give a shot at all.
I also wonder if these cats are getting too much insulin. I would hold Sunshine at the .5 you gave her today and see what she does. The new pen of Lantus might really drive her numbers low,so watch her as close as you can. If Jibbit's care was up to me, he would go back down too. I think I would wind him back down to 2 units and watch for at least 3 days. We usually hold a dose change for at least 6 cycles (three days)to let the depot either fill or drain, before we make another change, unless the cat has dropped very low, which earns an immediate reduction.
Better to high for a day than too low for a minute.