As i'm going up in deadlifting weight, i find my grip gives way earlier than any other part of my body, making me lose reps because the bar feels like it's slipping off my fingers. I tried incorporating hook grip into the exercise, and while the bar felt a bit more secure, I felt my middle finger was rubbing against my thumb nail and making it feel like it was pulling it out, and causing a bunch of pain, and no matter what I tried it always came down to that when the bar left the ground.

Any advice?