I'm flying two Valiants with the 175cdi. C.G. on both is at the rear of the wing tube. I don't use a rudder to elevator mix and they track perfect on knife edge.
I use rudder to aileron mixes and quite a bit of throttle to elevator down line mix.
I also have to push more than i have been used to when inverted. The positive expo on down elevator will be interesting to try.
This is the best snapping model i have flown. The model exits the 45 degree up line with 1 snap perfectly on line.
Bryan has previously emailed me new settings to try, but i have been time poor lately and haven't been able to make the changes yet.