I agree that alot of snakes get stressed when moved to a feeding tub, I can get away with it with my Ball python but then again he is the most laid back snake I have ever met... But my little blood python is only comfortable eating in his own tank, and he likes to strike right out the front door of his hide, so what I have been doing is just dangling the food in front of his hide entrance.

Alot of people dont want their snake to associate the cage being opened with feeding time, and that is understandable but it seems with some snakes it just cant be helped you may need to feed in their own cage. I noticed as well that when I open the cage up on my blood he acts as if food is coming but if i tap him with my tongs he will realize its me and not dinner, he just totally relaxes as soon as I touch him.