oyu shouldnt have any problems with it grabbing because TBT is designed to do just that.
the effective edge is defferent on a bord with TBT. u might have it so that the back binding is further away from the raised back edges than the front binding is from the raised front.
I didn't have this problem when I had my autos on it, with the default stance. I haven't had any problems with it till I tried to reduce my stance width. It felt so odd and so wrong after I strapped in. You might be right about the binding position in reference to the bevel. If I go back to the first stance I used, and it behaves better, then I found a major downfall for this board.