Barb,
I don't see numbers that would seem to be causing bounces, but that doesn't mean they aren't there. Take her AM cycle on the 17th for instance. You got a 97 at +5. That wouldn't seem to be low enough to set off a few days of bouncing, but maybe Chong went even lower than that, and maybe did so again that night and that caused the higher number the next morning? There could be some lows there that you just haven't managed to catch with a test.
I think I would drop back to 1 unit, and try if at all possible this weekend to get some tests in the +5 to +7 range to see what the lowest number you get is. If Chong is going into the greens, that could cause her body to react (we call it liver panic) in a way that she dumps glucose into her system because she hasn't seen numbers that low for a while. This happens to most kitties when they drop into a range of numbers that are abnormally low (for them) even though they wouldn't be considered "hypo" numbers. When a cat is used to living in the 200s or 300s, any number in the 100s can feel like "too low" to their system. I'm afraid if you just up the dose, it'll have the opposite effect you're looking for in that it will keep giving you lower numbers that her body isn't quite used to or ready for. Then you'll keep getting these higher numbers at shot time. Sometimes too much insulin looks just like not enough insulin on a spreadsheet, as non-logical as that might sound.
Carl