Never really did 1max reps so I dont know whats my max DL.

I can do about 12 reps with 220lbs, after that my hands starts to splip. Putting more weight it gets worse.
With more weight I can only do like 6 reps before the hand starts to fail.

What I mean is the hands fails before my body so I feel Im not getting the most out of exercise.

What can I do to improve my grip? Only way is to use wrist straps?

Cheers guys!