I have a H9 Sukhoi and love it to death so far. The CG is just slightly rearward of where "precision" flying is called for and it pitches pretty hard to the belly during knife-edge. With a rud-elev mix, I have slowly found that sweet spot where it does KE perfectly with half low-rate rudder. Since then I have another problem, when I do an axial roll with rudder I get some departure in the tail. When flying straight and level, rudder deflection gives me some ballooning as well. I think it hurts me a little on hammers and I see it really well on landings but nothing too hard to correct. Why is my pitch coupling different for KE and level flight? Do I need to run my CG forward?