What or how did you put holes in the tub?
What is the regular humidity of your home?
If you keep a comfy temp in your house I would guess that the humidity will be lower inside than out so therefor your tub should be closer to your indoor level with better ventalation. Maybe even putting a ocilating fan in the room would help that.
Maybe use a drill and put slightly larger or more holes in just one side of the tub. You said "poked" so I'm getting the picture in my head that the holes may be too small to really allow good ventalation.
Just popped in my head, hope I'm helping!
There you are Serpant Merchant. I'm glad you chimed in. Do you know people that keep it that high constantly. I realize that Africa may get higher but I doubt it stays that way 24/7. We can all live with a high change for a while but I would worry about the long term effect. I try to raise mine during shed but that's just a short time once in awhile.