No Lowell you ain't the only one , I started with a ground adjustable rudder trim tab when I first built my Series 5 , but found it insufficient for my needs, so I added a high torque model airplane servo into the rudder with a cockpit adjustable trim knob that has worked great for me. I did a write up with photos long ago , and they can be found with a search. Amazing how effective that little tab is in keeping that ball centered. Bruce N199CL