I also used the substrateless incubation method, and had condensation forming on the top and sides of my egg tub, from DAY 1!
I experminated a little with temps, glass top, rubbermaid top, water bowl on bottom on bator to raise the humidity in the air on the bator.
I found that when using the glass top (with no air flow to the box- which would give you the same results as using the press and seal) larger condensation drops formed. So I resulted in using a homemade rubbermaid top as shown in this thread. With NO press and seal.
http://www.ball-pythons.net/forums/s...ad.php?t=63015
Anyways I found that the condensation was not a problem for me at all. It formed throughout the incubation period, and I just wiped it off once a week when I vented the egg box.
I created a thread on this topic that might help.
http://www.ball-pythons.net/forums/s...ad.php?t=65519