What may be the cause of car hydroplaning consistently on wet roads?

Had three reputable shops in my area investigate my car and none have been successful in locating problem.Car will drift left and right on wet roads at less than highway speeds. Had alignment done and new all weather tires installed recently which did not help.All shops have investigated the ball joints,cv joints,control arms, etc. and they all state that the suspension is good. Please help one frustrated Prelude owner!