There is condensation in my observation hive and I'm looking for some guidance as to how much ventilation to provide.

This is a one-frame-wide hive and I'm not using foundation so the newly hived bees are hanging from a topbar and there is condensation on the glass where the bees are festooned. (There are enough bees to fill about 15% of the hive.) The entrance is a single 3/4" hole and the seal between the glass and frame isn't particularly tight. I've drilled about 40 1/8" holes in the outer frame which didn't seem to do much to reduce the condensation. Should I keep drilling more and/or bigger holes until the condensation goes away? Or is a little condensation OK?

Thanks!

(Here's a picture of the hive. It is about 18" square. http://www.z2a.org/photos.bees/tboh-med.jpg )