I don't think it is a bad thing to practice turning with the rudder. If the aileron servo goes and you have no left hand coordination, you're in a tight spot. It's happened to me before and I was able to land the plane with rudder and elevator. I was at a fly-in with my combat ship. I'm still flying the plane today. I've seen others crash when the same thing happens.

I have a Sweet Stick 40 with the TT 46. The plane does have quite a bit of roll coupling. It also has a tendency to pitch up also. If you have a large surface and a lot of deflection, the drag will increase greatly up high as you apply rudder which may cause the plane to pitch up. Also as the plane banks with positive rudder, it will pitch up.

I can't do a single roll circle with my stick due to the roll coupling. At times you have to input near full rudder and you run out of aileron. My Ultrasport could do it. I also have to feed in almost full opposite aileron to hold knife edge with the stick. My Ultrasport held knife edge with very little aileron or elevator correction.

Take a look at a Cap's rudder and compare it to where your's is at. The high rudder will make it hard if you have a big surface and a lot of throw. Play with the rudder, it is the only way to learn how to use it. I've seen people practicing for pattern contests and I watch the slow rolls. Half of the people don't use rudder and the slow rolls aren't very pretty.

If your stick is like mine, you'll be able to hover, do slow rolls, multiple point rolls, snaps........just no single roll circles. It's a fairly fun cheap plane. I've had mine for 5 years.

My $.02