I wasn't getting food spikes before. Now we are, along with the inversion you just mentioned,
What does that indicate?
Actually, look closer. You were getting food spikes before. Not every cycle but you did get them. That happens...just like nadirs shifting, sometimes they get food spikes, sometimes they don't.
An inverted curve is when the PSs are lowest and the nadir is the highest number in the curve. Inverted curves can be seen from too much insulin, too little insulin, or a late nadir. If the kitty has gone up and down the dosing scale according to protocol, it is extremely unlikely that an inverted curve is due to too much insulin and typically an inverted curve from too much insulin would have a much higher nadir than the PS.....not just a minor variation. We don't usually get too concerned about inverted curves unless kitty is solid green and looks like he/she is ready to go OTJ. Even then, it wouldn't necessarily be considered too much insulin unless the lows are TOO low.
I think the best place to look for more info is the Think Tank. You might find something more there.