I have a couple of Ultra Sticks with flaps and crow set-ups. You will want to mix in some down elevator because the plane will pitch up when you put the flaps down. Start with about 6-8% down on the elevator and adj from there. Dont flip the flaps at high speed. Get the plane up about 80-100 ft and flip the flaps at about 40% throttle to see what it does. If it pitches up a lot, add more down elevator.