It took 95% power setting on Idle 2 to get the wagling stopped. I am surprised that it needed such a high head rpm to straighten things out. The 600 runs very well at 70%. The advice to increase head speed was spot on, thanks for the advice. I do not have a heli tach but the head speed has to be on the north side of 2600rpm. I guess I have a few more things to learn on the 500.