Boat has a 225 merc with 24 fury and standard Manuel jackplate. The issue is when I try to run it wide open I can't get the motor trimmed up past half way on my gauge before it starts walking really bad, I've tried staying in it to see if it would come out but it just gets to dangerous and never seems to work. I'm around 54-5500 rpm's and running 71-72 mph, my trim isn't even over the half way mark. I know the trim gauge is only supposed to show 3 quarters of the way when fully trimmed but I can't even get close to that with out the boat getting out of hand. Any advice on what to check or change first will be appreciated.