Improve your grip; Keeping pulling the deads raw grip and in less time then you think, the grip will catch up.
Also, if you do deads with a stop & pause at the bottom instead of a bounce, its a bit easier on the grip because of that brief time of release at the bottom.
Also, if you do deads with a stop & pause at the bottom instead of a bounce, its a bit easier on the grip because of that brief time of release at the bottom.