The pressure of the water under the hull pushes the V floor upwards, you end up with a hump at the back of the boat.
As I said its not dangerous and really only happens on decent boats if you have an under inflated floor or have the biggest engine at WOT and a full boat. Its a well known problem with all V floor boats, some are better than others, the Bombard is the best by a country mile.
All boats are a compromise and you will never find perfection, its doesnt matter how much money you have you always have to make some compromises. Even Eclipse had compromises with her hull design (to fit the underwater doors for the sub allegedly
The trick is to buy a well respected brand (all of the ones named over the thread meet this requirement) and then if you dont like it or fancy a change you can sell at very little loss.