I had seen a thread a while back where someone suggested feeding in a thoroughly cleaned tub for problem feeders. I looked but couldn't find the other thread that I saw this in. That advise seemed counter-productive to me but I have 1 nut-case snake that loves to refuse feed. She refused again today making week 6 of refusals. Since she is around the weight that I usually move them up in tub size. I moved her to a larger fully cleaned tub. This should have caused a bit of stress. Then I tried again to feed her but it was a small rat instead of weaned. I figured the larger prey would also stress her out but she nailed the small rat in a couple seconds and ate it.
To sum it up
Larger cage should cause stress
clean cage no longer smelling like home should cause stress
larger prey than ever taken should cause stress (especially after a refusal the same day)
Slight handling to move to new cage maybe a tiny bit of stress
And this crazy girl goes off of her fast.
I am beginning to think there may be something to trying the cleaned tub for problem feeders.