Just make sure the temps are in the right range and then leave him alone. Handling him a lot will only tend to stress him out and he's already recovering from a regurge. Just aim for warm temps in the low to mid-80s and cool temps in the low to mid-70s and then leave him be.
I know it's hard to not worry or constantly check on them, but it's for the best that he gets his rest and doesn't have added stress from being handled frequently. Also, he will go to whatever side he likes the most. I've had snakes that did just fine digesting meals and spending most of their time on the cool side. In a matter of speaking, he's genetically programmed to know how to thermo-regulate...just trust his abilities!
Good luck!