Your warm side could be a little higher...92-94 is best...and your cool side should be bumped up as well...82-84. That could explain why your snake is hanging out on the warm end also.

Also, check your hides...some will prefer the security of one over the other (hence why he asked if they were identical).

And finally, sometimes snakes avoid an area they have defecated in. Check inside the hide for poop or urates or dirty bedding, they could be avoiding that.