I've been having quite similar issues. To be honest, I'm a little stumped as well. Moisture levels through the roof, constant relighting. When I'm finished with my bowl (to be honest, it rarely makes it there), and I let it cool down a bit, I'll remove my stem only to find it dripping. Not sure what's up. I own a curved pipe, and I thought that might be the issue at first, but even after being very careful, moisture still occurs.
Do you smoke outside? I do, and I'm beginning to wonder if perhaps the wind may be what's causing me issues.
I've always packed on the light side, so perhaps giving a tighter packing a try might help. We'll see.