Good explanation Willis. I was aware of the need to reduce the flap area on the Cardinal, or use more elevator throw. I tend to use about 35 degrees max on the elevators, and about 26 degrees on the flaps for my Pathfinders.
The reason I asked was to answer some questions I've had. Originally, the Pathfinder had the elevator hingeline at 50% of the total stab-elevator chord. Gordy and I talked about some problems we'd seen, and he decided to go to 60-40 with the elevators at 40%. It seemed to help a lot, but I often wondered what going the other way might have done.
I'll bet that your plane is more comfortable with the flap and elevator throws equal.
Most Profiles will twist in the air. I b elieve that the problem is caused by the circular airflow coming off the prop, and affecting the stab and rudder, causing the twist. Believe it or not I built a Pathfinder with the stab tilted down, lower at the inside tip, about 3 degrees. It looked strange on the ground, but in the air, it was straight. I attached a pic of the plane, but I'm not sure you can see the tilted stab-elevator very clearly.