I had the exactsame problem as you, tried all the tricks even the best gyro and still no luck.

In a nutshel the problem with a ROO on take off is that the rear wheels get light and the plane has a tendency to rotate around the nose wheel. When the ROO was designed it was ment for a 12 pound thrust turbine, You have a lot more thrust now.

Here is my bullet proof set up for over 100 flights.

2 degree toe in in the main wheel

make sure you have the rear caster strut form Robart for the nose wheel

adjust nose wheel to about 5 degree left & right throw on take off.

ensure one of your brakes is not dragging more that the other AFTER you applied a full stop such as on an outbound taxi.

make sure you hold FULL UP ELEVATOR until the plane takes off and then adjust elevator for the climb out angle that you desire.

I also found that my take offs are a lot easier at 2/3 throttle than full throttle.

Good luck

Peter