Toffen how much wheel input are you dialing in @ WFO?
I did a test on a tunnel boat that was doing a lot of crabbing at speed. W/the boat on the trailer I set the motor straight and then put a wire tie at TDC on the steering wheel then made a pass.
I found that I was correcting for crabbing w/the wheel by turning it approx. 90* or to the 3:00 position!
It was an OMC case w/the tiny skeg so I sketched out a pattern and had a fab shop add a plate to the skeg simulating what's on a Sportmaster. Approx. 50% more surace area than OEM.
Re-tested and cut the crabbing my 50% and was much easier to drive.
The plate added to the depth of the skeg as wells as length which allowed me to run the longer torque tamer that was too long for the OEM case.
If it truly is "blowing out" the bow will drop and the steering wheel becomes a handle