I don't have a lot of experience keeping carpets since this is my first year with them.
I have 0.6 Irian Jayas and it was easy to switch them to ASFs from mice. I think one of them held out for two weeks before eating an ASF. These guys have the best temperament. None of the IJ's have ever tried to bite me.
I picked up three coastals. Two of the coastals eat anything (mice, rats, ASFs) and both of these are nippy, although young. The third coastal has never tried to bite me but only eats rat pinkies.
I also have a jungle who will eat anything. She doesn't bite (anymore) but will occassionaly butt my hand or arm with her nose.
In my opinion every snake will have their own personality (temperament) and feeding response. I feel the key to get any snake to eat what you prefer it to is by starting them on this prey item at an early age. I alternate a variety of prey with my snakes at an early age. I feel by doing this the snake will get use to a variety of scents as potential prey.
David