Andrew:
I used the full recommended 5/8" U/D elevator w/ the 50% expo. and it works great on grass fields as the full 5/8" keeps the tail well planted during the landing roll out.
As stated in my previous post, I had replaced the 4" soft foam supplied tires with 4-1/2" sulliavn "Skylites".
Dick:
How where your "thorws" settup ? Just comparing notes.

BRG.