After 10 builds of my own and at least 15 other rear spars that I've drilled, I now just line up the stub with the bottom of the fork and drill in the middle. Done numerous first flights on these planes and they all fly the same. The elevator counterbalances are "faired" at cruise speed.
My 2 cents!
RV4, RV4, RV6A, RV8, RV8, RV8,RV8, RV8, RV8, RV12