Wear a towel on your waist, or what I sometimes do is to wash my hands every so many games...
I feel like the glove is a weakness. I feel like once you get used to competition you don't sweat as much. As far as the humidity...I wouldn't play in a place that didn't have air conditioning. That's miserable.
I know many pros play with a glove...but it ain't for me. I want to feel that cue in my hand. I want to feel every bit I can. I want to show that I can control my stress levels and perspiration. I don't want to give up any signs of weakness.
That's just me.
If you don't play with an expensive cue, try green pad or fine sandpaper to expose the raw wood...it will soak up moisture...but if u play with an expensive cue, I'd wax it...to keep the moisture from getting into the wood. Try loosening up your bridge, turn your hand a little to enlarge the opening...
Just don't wear a glove, and stay away from that damn powder!!!!!!!