RE: Aileron differential
Flyboy,
You are correct in the adjustments required as a result of your roll/yaw findings. The reason the "up" aileron is suggested for adjustment is because increasing the amount of "down" aileron will increase the stall speed of that wing. The larger the "down" surface deflection on a surface, the higher the stall speed of the surface. That's one reason why flaps are on the inboard section of a wing. It causes the center section of the wing to stall first, not the tips. My technique is to adjust the "down" aileron to a lesser deflection rather than increasing the "up" aileron deflection. This accomplishes the same thing without increasing the stall speed of either wing. In flight this is usually not a problem, but at slow speeds on final it is a significant issue.
I haven't heard of the 45 degree profile, but it should work fine. I like to fly the plane directly away from me and do a roll to see exactly what the tail does during aileron deflection.
Paul