I paddled with a competitive surf boater from Santa Cruz when I was in Costa Rica, and he showed me a duckdive that he uses with his glass boat in very big breaks. He showed me a couple of them in flatwater on the river & it would appear to work very well, but it's all about timing. As you're coming into a breaking wave with forward momentum, flip over on you back deck w/ your setup as a rodeo roll. Instead of a hipsnap, immediately give your paddle a downward pry above your head. This causes the bow to drive down through the face of a wave (upside down), while the force of the wave's energy travels over your hull. It really has some similarities to the donkey flip, but stalling the roll longer to let the wave pass:
It looked like it would take some practice to really get it to work effectively, and this guy was obviously a very good boater who spent most of his time in heavy surf, so I'm not sure how long it would take to master it. But that's supposedly how it's done.
Whenever I go out in the surf (not often, although I stayed in Dominical for 2 months and board-surfed about 2/3 of the time and boated 1/3 of the time), I would usually charge the wave and turn the boat as high on edge as I could and drove the bow through the wave, trying to minimize the lift up the face. I still got my share of horrendous beatdowns, but it worked most of the time.