@Scroggin
I am 6’4” and i have the normal setup. My rudder-pedals are in the most forward position possible and i only have a 1” seat-back cushion. To raise my eye-sight position i either use a 3” thick foam-pillow to sit on or my seat-pack parachute. A back-pack parachute, even the thin ones, would push me to far forward to be comfortable with the aft stick travel stop position (straight/stock stick).
It works out for me, but the total height / body-length says nothing in particular.
You should measure your leg length (spine to toe) and torso height (Rear end to hair end) whilst sitting straight.
Then compare to the data to the cockpit dimension on mothership homepage or In the construction manual.
Easiest and best would be to (seat) test it in a RV-8 itself.