if you are having issues with humidity I suggest something other than aspen, it tends to lower my humidity not raise it. I have cyprus mulch in my tank ( most of mine are in tubs) and it holds humidity very very well.

the other things you can try are a plexi glass piece to cover the 2/3 of the tank top not used by the lamp.

you can position the water bowl on the hot side or under the lamp and also put sphagnum moss in if you still have humidity issues.

you are going to have to fight with the humidity as long as you use a light/heat lamp they suck the moisture out of everything. I would recommend ditching them for ambient light and a UTH.

hope this helps a little ask away if you have more questions