Do you have a fan pointing at the rack? That should improve your ventilation.

Is it just the large tub, or all of them?

- - - Updated - - -

Quote Originally Posted by 1nstinct View Post
Try putting a few holes in the top, I had the same problem on my old rack and put 5 holes above the water bowl and it dropped it down to a constant 52-56.
Tom
Ofcourse I can't see the rack but if you drill holes in the top won't they just be covered by the floor of the above tub space?