i don't use mixing, but i do use exponential on the elevator, for landing mainly. my warbirds seemed touchy to me when i slowed them down- my stupid thumb had a problem applying the right amount of elevator to flare them without porpoising, and tending to bounce. so i started putting about 35-40% expo in the elvator, which makes it less touchy to me for landing. works great!!
by the way where did you find a great wife like her? man you are a lucky guy-
ed