If you hold your guard up the sweat will run down your arm instead of into your palm!
The technique is all in how you hold the stick, not just your arm and wrist but the fingers and thumb, palm and heel of the the hand.
...wait one sec! You do have proper sticks yes and not the thin, laquered ones with a fancy, fired pattern? Nothing wrong with those for training (even though I dont like them) but give yourself the best start and get natural rattan with the nodules still intact.I think they call them Bahi sticks. You dont have to get the broad heavy ones, thin ones are good. But if you look around you can get these ones which are dark brown with the natural ridges and treated in some way but dont have the mega-shine laquer.
At the end of the day a stick is a stick though. Practice with different types of stick each day is best. Different length, weight, diameter and surface finish. That will make you better than your partners!
Actually, now I think about it - maybe you could try a light sanding of the laquer to take some off??? TBH I would lose those little fired sticks though and go for natural.