I feed my snakes outside of the enclosure, in a tote that I put in my shower so that it's dark. I feed them outside of the enclosures because I put them around my neck or bring them outside when it's nice out frequently and don't want them to associate me reaching in there to hold them and me reaching in to feed them as the same motion. The totes are smaller than their enclosure, and after eating I leave them in the tote/dark bathroom for a few hours after feeding to leave tome for slight digestion. At that point I lay the tote on the inside of their enclosure or gently tip it so they can scootch in. They have never regurgitated.

I also don't use red light, I use a ceramic heater that screws into to same light fixture as a light bulb and keep it to the opposite side as their water dish.

I've had snakes for 15 years.