Dave,
Didn't get a chance yet to try out additional aileron differential, looking forward to trying that path also, along with a gyro. I have only seen one full-scale Vampire fly, and the pilot told me she was a rudder airplane, so not surprised when the model is similar, usually is. What I need with this bird is more than 9 channels so I can dial in all these ideas, I would like to put the two ailerons on different channels, and a rudder gyro with programmable gain for gear up versus gear down setting. It's a long summer, so look forward to trying out some ideas when the weather breaks.
Jim