how do you lessen the roll coupling of a bipe(ultimate), when the rudder is applied- as in knife edge flight? i haven't built it yet (Sig's profile ultimate enlarged), so i was wondering if i could raise or lower the stab to lessen the coupling. right now it is located on the thrust line. i know it won't be totally eliminated, but was hoping to lessen it. on my 44" bipe it couples pretty good. the big one will be 88". i wonder if the bigger size alone will help in reducing the effect.