I have not flown my Zen 50 yet, so I don't know the flight charactoristics yet. All my comments are based on previous pattern ships I've had. The last one was a MK Blue Angle 40. The Zen 50 is basicly the same. I used a Como .50 with 15% & 10X6 or 10X7 prop with it & this combo flew great. I'm not sure I understand what you are explaining about falling towards the canopy. If I I'm guessing correctly, you are having to feed in a lot of down elevator to keep it streight in knife edge flight. I would only change the incidence if your streight & level trims are way off - i.e a lot of up elevator trim. If you have a lot of up elevator trim, make sure your CG is correct. What ever change you make to knife edge flight will also, effect all the other flight attitudes as well. You may have to just get acustomed to feeding in the down elevator or set up a switch on the radio to get you into knife edge mode. Goo dluck.