I have "O" x3 which I've really gotten into lately. I'm not sure if I'm keeping them on too long--or if it's a skin issue on my nipples. But when I go to take them off--my skin sticks to the rubber coating. I love, love, love this product--but taking them off--OW! (gee, I know--I'm complaining about nipple clamps causing pain-crazy, huh?) Is there anyway I can prevent my skin sticking to the coating?