i recently purchased a 21' falcon center console, with 135 mercury ob and a 15' prop. The bottom of boat has a deep vee design in front that goes flat in the rear. the bottom is also slick with nothing but the main keel to provide straight line running stability. There is a tee top and 12"x9" trim tabs.<br />When running above 35 mph, it is a constant steering back and forth to keep it on course. it is worse in smooth water than it is in rough water.<br />I have thought about welding fins onto the trim tabs to try to get it to track better??? or would putting the motor on a jack plate help???<br />What can i do to fix this dangerous condition?<br />Please help!!!!!thx