The resistance to pitchpoling also has to do with rounded foredecks. They can go under the water at a slight angle and still pop back up. On a boat with a flat foredeck, it acts like a plow once it submerges causing the front of the boat to decelerate (while the back stays at the same speed!) and pitch downward even more. That's not to say that you can't pitchpole a boat like the 5.2 but it is a little more forgiving.