Thanks for all the replies.

I'll try moving the oasis around...

Brain Fart: It IS an XL Plus... That should change things.

I thought about cutting slots in the singles trays. I can do that myself.
Airflow also occurs up the back inside of the humidor. The shelves don't go flush to the back.

Do you really think I'll get cedar bleed? It took Randy (carpenter) over a year to build the thing for me

Will