One thing I over looked earlier...the Reptizorb liners.
I'm thinking if you simply changed to paper towels your humidity issues may resolve themselves.
Sure, it's not as thick/absorbent, but messed get cleaned up right away anyways so I'm not sure how good of a trade off the extra absorbancy is, for humidity issues.
You can see everything on paper towels too, and paper towels are a helluva lot cheaper than the liners. Plus no shipping fees.
Edit - I know you said you didn't want to change substrates, so this is just a thought. The only thing paper towels don't have is the extra absorbancy, which seems to hinder instead of help your case. Might be different once you get the guns out of there, though.
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