Air-Tight Incubation Tubs?

[Stewart_Reptiles]

My apologies for all the questions, but I do have one more concern. Monitoring with and without press and seal I get 99% humidity in the tub with the press and seal and I'm sitting at 84.5% humidity in the tub without. This is just for testing, there are no actual eggs in the incubator. It has been about 14 hours since the tubs were sealed. Obviously the one without press and seal is too low. I'm using substrateless with perlite so should I just try adding more water to the non press and seal tub? The mixture right now is about 2 to 1 water to perlite (by weight) and there's no issue with the light diffusers sinking yet.

Thanks!

I use substrateless method as well in a 7 quarts tub I do 4 cups of perlite 2 cups of water and never had to use press and seal, I have been running the same setup for 10 years now and I do not even measure humidity anymore, eggs stay nice and plump until the last week of incubation and no build up condensation, which allows me to put the eggs in the incubator and never have to think about them till they are ready to hatch.