I use the hook grip for Deadlifts, however if I’m going over 80% for more than 2 reps I use straps. That way I don’t wear out my thumbs on multiple reps. I only use the hook grip on weights around 60-70% or when I’m doing heavy singles, that keeps your thumbs from feeling like they’ve been ripped off.
you should get used to it in a little while. I’ve been hook gripping since July when I switched to OL and it only hurts every so often. I do jam one of my thumbs once in a while, but that is from putting the bar overhead and not from the pull.
that being said I haven’t really picked up to much weight yet, not anything near my deadlift max really. =D