If his flies like mine, it has roll coupling first, then pitch coupling comes in later. You can't simply move the rudder on that plane and not have to move the right stick in two directions. It is possible to get a good ke, but you need speed and small rudder inputs to stay smooth with it. It's impossible to go full rudder for very long without it snapping out. I fly mine mostly on 50% of max throws on all surfaces, but I could still stand to tune it down some. Even with gobs of expo, it's just got too much maneuverability.

As for the knife edge, it rolls out, so you need to feed in opposite aileron, then you need to pull the nose up with elevator. The bad thing is that you can't simply hold the sticks still and watch it go by. You need to keep both sticks moving all the time, like you are trying to balance on a beach ball on one foot. It just likes to wander around, and for every angle of attack, there is a new control combination to stay straight. That's the best way I can describe it. The more nose up it is, the harder it is to fly.