You should try using the rudder. It is there for a reason. For a aerobatic pilot, rudder is an extremely important surface and one of the most fun. Even for a sport pilot that flys no aerobatics, rudder is still important for slips, etc.

If I understand you correctly, I believe you are asking why the hinge line isn't perpendicular to the long axis of the fuselage. On some planes, it may be cosmetic, but on most with that design, it was calculated and intentional. Rudders tend to cause what is called coupling, that is a rudder movement will impart a pitch and roll component as well as the intended yaw. There are a lot of reasons for this and it gets technical as it involves the rudder shape and placement, wings, fuse, CG location, dihedral, etc. I could explain further, but if you can accept that rudders have unwanted roll and pitch forces as truth, I'll leave it there.

What the designer of the plane has done has tried to change the pitch and roll effects of the rudder. On an aerobatic plane, the designer will attempt to design the rudder such that there are no pitch or roll effects, i.e. pure yaw only. This often requires a hinge line not perpendicular to the long axis of the fuse. On non-aerobatic planes, the designer may actually design in a specific pitch and roll effect. Typically this would be same side roll and a little up pitch. This helps coordinate the plane (prevents slip) and increases AOA of the wing a little (makes up for lower airspeed with rudder input by increasing wings AOA.)


Hope this helps. CHeers.