Maybe if you put something under one side of the tub to raise the one side about an inch. This would cause the condensation to roll to the low side and down into the substrate instead of collecting in the middle of the lid and dripping.

Disclaimer: havent tried this, but i think it should work. I think i read this somewhere last season. Maybe someone else can weigh in

0.3 normal bp, 1.0 albino bp, 1.0 lesser bp, 0.1 spider bp, 1.0 jacksons chameleon, 0.1 veiled chameleon, 1.0 pit bull doggie