RE: TO KANT OR NOT TO KANT
Depends on what you are calling "broken wrist" BC. I seldom see anyone shoot a longbow with a straight wrist, but to me a broken wrist is a low wrist grip, or "heeling" the bow.
No problem at all Head--Mr. Asbell does have some good info. I just refrain from recommending him due to statements (I think in his video, maybe in his books also) such as "you can't shoot accurately using 3-under". I don't shoot 3-under, but some of the best in the country do, so I know that's not accurate.
Again though, everyone is different--what works great for some doesn't always work great for others.
Chad