keeping your temps constant is pretty important, of course the weather changes and it will go up with the warmer weather... but a range of 90-100 is too broad IMO.

i know nothing about tank setups... as i use bins... but i do love aspen.

you only have one hide... you need two identical hides for your snake and if the tank you have is the right size, then i'm guessing your hide is way too big. you want a snug hide for him.

how's your humidity levels?

and trust me... you snake is digesting bones, fur and teeth... a piece or two of aspen isn't going to bother it at all! you can feed in the tank with no problems.