Yes, we have an hour of conditioning after every practice and I do reps of wrist strengthening with weights and we stretch our wrists before every practice.
I am working on my bhs on beam and have done it on low beam with no mats a few times. The problem is that every time I work on them, or any sort of tumbling requiring hands, my wrists really start hurting. I feel like its stopping me from not practicing as hard as i could be and I dread going to...
I had the same problem of going crooked in my round off and it really helps to lengthen the space between your hurdle foot and where your hands go down. Hope this helps and good luck! :)
Another great drill for me was placing a hill against the wall(fat side down) and doing a backhandspring to it, stopping in a split handstand against the hill. It really helps if the end of your bhs is kinda messy! :P