All Good advice, I'd trust the temps to Jeff, he has experience with CRB's.
Now that you've had multiple regurge. STOP, wait at least two weeks and better three before attempting feeding again. Go with a small meal. If Jeff's right about your temps being too high, your CRB should keep that one down. Then wait two more weeks before feeding again. Still with a very small prey item. Once you have him/her holding food down, slowly work up size and frequency to normal.
Regurging will loose some (maybe lots) of the helpful bacteria and you need to slowly rebuild the colony.
>>Derek is right that stress may be the problem. I would also drop the temperature. My Colombian Rainbows are in cages that are in the low 70s in the cool end and high 70s to low 80s on the warm end. They spend most of their time in the part of the cage that keeps their body temperature in the mid 70s.
>>Jeff
>>
>>>>Stress?... is it in a high traffic area?
>>>>do you handle it after you feed it?
>>>>does it have adequate hiding space?
>>>>do you keep constant light on the snake?
-----
Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
19.29 BRB
14.19 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 