Ok, Broke out a new pen, something is not right here and I have a substitute doser for two days.
I"ve reduced his food by a full can/day and he's going up, and is CRABBY about the food reduction!
Unless you think there was something wrong with the insulin, Tigger's numbers look pretty much the same. Once you're back, it may be worth getting some blood off to MSU for acro/IAA testing.
I'm probably not remembering this, but how are Tigger's teeth? Has he had a dental?