If your grip hand is sliding on the wrapless cue, you may be unconsciously gripping the cue too tightly due to it sliding in your hand from the sweat.
The other hand, your bridge hand could be moist and the cue shaft kind of sticks occasionally to your fingers as you are stroking and this causes unwanted decelleration of the cue as you complete the stroke.
If washing your hands doesn't dry them up enough for a long enough period of time, use a glove or finger slides.
Even when I travel to non-humid areas of the country, I still use the glove. I guess I've just gotten use to it as I know that even if my hands start sweating, the shaft will still slide smoothly through my fingers.
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