There are several things that you can try, Woody's arrow lube, a bar of soap rubbed on the shaft, heck I have even been told to use some good ol' Armorall. If you have ever sprayed you steering wheel with that stuff and then tried to turn your wheel, your hands will surely slide really easy. I know, been there and done that. Same concept should apply to your arrows, the only downfall would be the scent that Armorall leaves. The Gorilla Grip is a good product to have or you can get one of those rubber pot holders that you pickup hot handles off of the stove. I believe you can pick up one of those at Wally World for a couple of bucks. Look in the cooking utensil section. Just a few suggestions, good luck and good shooting.
Scott Longhorn III
Easton Fatboy 400 (344 grains- 260fps@58lbs)
Specialty Archery Superstix
NAP Drop way
Spot Hogg Sights
"A bad day of target shooting is still better than a good day of work".