So far I have only tested in my backyard but after changing the Q_PIDs it seems to be ok and I can control the yaw reasonably. I will know more after this weekend and post a video where I can test it better in an open area. My backyard is rather tight with trees and upper canopy.
Before the Q_PID changes, the the wing was twisting along the CG since the plane was never designed to handle these forces. The Q_PID changes, although roughly done, seemed to help this a great deal. It will be interesting to see how this performs in some wind and determine if the wing needs additional support to reduce the twisting.
I looked up my Q_PIDs for my Bix3 conversion and the main difference I see is that FILT is set to 10 instead of 0. I will have to test this difference. My Ranger EX IMAX parameters are double the Bix3 due to the weaker power to weight ratio.
Bix3 QuadPlane Q_PIDs