Here is a mod I am just trying. I took some old Ultra Stick 120 flaps and added to the rudder. I covered the new piece and just tapped it to the rudder with packing tape. If it helps I can glue it up and recover the new rudder. I saw Dave Robelen do his 120 the same way. I have flown it twice but the wind was really gusting hard so more testing is needed but it does help the KE and Hammerheads.