I don't remember where I read it, but I vaguely recall it being said that wrist curls will not really do anything good for your grip and they'll cause you grief. I want to say it was a Westside Article but I can't recall. I've always just stayed away from them and figured my forearms get enough work with everything else I do.
That's because you don't have your wrists in line with your forearms and elbows on OHP and bench, guaranteed that you do both, especially OHP w/ your wrists cocked back. Get your wrists straightened out. forget about wrist curls forever