You certainly have been able to relax today.

I take it the FF was mixed with the other RC higher carb wet food? That might be propping up Bg a little but there's also the lower dose and the bouncing after yesterday's greens. Are you planning to gradually phase in the FF and end the RC, as well as no dry? That would be best for his diabetes. It's difficult to see what the best dose might be while these three factors are operating - partly higher carb food, lower dose, bouncing from low numbers. One day at a time ...