Just a quick update:

I added the moss as suggested and foil taped some more of the top. It helped immediately! So much so that yesterday, he shed in one full piece! WooooHooo! Gotta love it when it goes like that!

One thing that I did change - I added a layer of cypress under a shallow layer of aspen. I liked the humidity adding benefit of the cypress, but did not like how coarse it was. I added about a 1/2" layer of aspen on top of this for good bedding and my humidity has been around 54%.

Thanks again for all of your advice!

Oh yeah, will be posting some pics in the next couple of days!