I have a 88model Ev 90hp my TnT will not work when the boat is running at WOT it's like it doesn't have the power to push the foot back against the tourqe of the prop.... it works fine at idle speed ... if I don't have the motor trimmed all the way down when I take my hole shot.. the motor will close down to the "trimmed all the way" down position... when at Idle the trim motor sounds find and responds very well... can this be caused by low fluid? I saw instructions on the board on how to check the fluid on a 84 model motor and was wondering if my 88 was the same ...