What I was told last time I was here (1st diagnosis and 2nd diagnosis cats follow slightly different "rules") was that under 120 you don't shoot because it's a healthy number. Right now my NS number is around 90. I don't think you should shoot Pita that low though. Sam's on his second rodeo so I'm told you have to be more aggressive with following them all the way down the dosing scale. I think if you're home to monitor, it's going to be a little bit of going with your gut on when to shoot below 120 and when to skip. You could still give a 0.1 or a Drop of insulin if you start to get a more dramatic response to shooting the lower 100's.
I agree with Rachel that if you aren't going to be around to monitor, I would raise the NS number a bit for the sake of safety.
It gets a little tricky, the farther into the NS zone you get. In the first few days, I would say that you shoot as soon as a shootable number pops up. But if you are on like Day 8 of NS numbers and get a 122 or something, I would wait for a second number before resuming shots. Those are just example numbers/days. There isn't a "rule" about Day 8 or 122 or anything. It's kind of a gut thing.
Basically I'd say just keep posting a lot and keep eyes on it and we'll all figure it out together! This part of the journey has been a little tricky and uncertain for us too. It's a lot of guess and pray.
Oh, and you asked what would have happened if I hadn't shot on that first blue. Who knows? My gut is telling me that he's not ready to go off of insulin yet. His numbers are in the healthy ranges, but he's still getting some insulin that's holding him there. Tonight is an example of that. I dropped his morning dose a bit, and he's back up in blues this evening. So he still needs the insulin. Maybe he would have gone back down if I hadn't shot that cycle, but more likely he would have started rising again.
It's ok, he's looking good. Maybe it will be a cycle like last night and he'll be blue at PMPS again 
