sounds like chine lock? my tige 21v RE used to have that problem all the time.. i outfitted it with a 4 switch Hippo ballast system available back then and anytime in a tight turn with passengers and sacs loaded, the chine would lock up and make correcting the steering very difficult, almost impossible, until i came off of power.. my buddy's first generation x star dealt with it quite a bit.. usually by just coming off throttle enough to subside thrust on face of hard-turned rudder will allow you to regain control.. of course, perfect pass back in those days would always compensate for loss in boat speed by accelerating while turning and sometimes made for some hairy situations when in tight quarters..