Joe,

I think your results concur with mine. Add some area below the thrust line and your knife-edge performance will improve. I am now able to do long extended knife-edge passes with ease. I have not programmed a mix, I am just adding a slight amount of "up" elevator control. No roll coupling present. A buddy in the club maidened his stock UCD this weekend. I noticed when he attempted rudder turns, it wanted to snap out of the turn. This is not present in my modified UCD. Congrats on your mod!