I installed the trim tab as received from the factory and the angle was dead-on perfect for torque compensation. I have not had to adjust it since installation.
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 840+ hours (as of Oct 2019)!
through June 2020.