I use Triad ESTs and love them, best bindings I've owned in 16 or so years. As for them moving, crank those suckers down, don't dimple your base but get them tight, you can make them tighter than normal since you don't have to worry about stripping the insert because it is removable and replaceable. A conversion disk is rather pointless on a channel board, you can get last years ESTs for pretty cheap new.
Note: Triads aren't made anymore, at least with the EST system, but you can still find them. They are similar to the Cartels but more flexible. I think someone here is selling them too, check the buy/sell thread.