I would ditch the aspen. I know it sucks to lose money but you're having a humidity problem and it will be better for your snake if you get a substrate that can better hold and tolerate moisture. My recommendations are either eco Earth (coco coir) or some sort of Cypress mulch. Both are good at holding humidity. If it is still completely necessary, get some sphagnum moss and mix it in with the substrate/make little hedges around the edges of the tank. Soak it, wring it out a bit, then place it inside and mist it here and there. if that is STILL not enough, dampen a hand towel and place it over the hot hide. I have had to do all of this, but now my humidity stays at 55-56% throughout the day. It pays off.
Other then that, PLEASE, PLEASE get that other husbandry on point. Your beep will not eat until it is fixed. If there is anything to cut corners on, proper husbandry is not one of them IMO. Even is you get the most inexpensive things that'll do the job, you should still get them. Good luck and I wish you the best!