My Skyray is a bit tailheavy, but still needed the LO's moved forward. I tried taping a penny on the inboard tip and it was not an improvement, so I taped a penny to the outboard wingtip, and that didn't help either. Hinging is either too much tipweight or LO position, so 'speriment with both. Also get rid of most the rudder offset, and maybe put in a small dab of engine offset (to tighten up the lines quicker when they do go loose). Getting a trusted buddy to fly your plane can open your eyes to trim problems that you are overlooking. Good job! Nobody asks me to fly their plane.
Anyway, 71 is 20 better than 51, but either works. OTOH, 91 is about 20 too much, especially with 90% humidity.
Steve