Hi Kathy -- Honestly, I think I'd hold off at least one more day, during which (since you are home) you can get a curve. Here's why: looking at your SS after your food switch, it seems that every time he goes low (for him, of course), he has a pretty big rebound/bounce into the reds. His little body clears the high BG, then has a nice cycle, and then he pops up again, clears it, rinse, repeat. I would ignore 2/27 altogether as that is certainly a result of him having no insulin the PM before . . . and then he cleared it, and today's AMPS was great on one unit last night. If his pattern holds, I would expect him to be slightly up again the next cycle.
So it could be that his body just needs a little more time to get used to being in the better numbers and to "learn" that he's not in any danger from being, say, in the low 100s, and overreacting to them as the SS suggests he's been doing. Giving more insulin would make those lows lower and therefore probably send the bounces higher. Holding the dose for at least a little bit longer (with a curve) would give you both a little more time to see if he can level out/settle a bit. The hope would be that his "bounces" from what is for him a low number would get smaller, and you would see the PSs coming down through the pinks and then hopefully into the low yellows. Then once his body is used to that, you might try a small increase to get the overall numbers down, with the nadirs into the dark greens.
That is just my two cents. I think that I am more conservative than some people, especially with newer cats who are being diet-adjusted, and so others may have other opinions.