I'm 6'5" as well and know your pain well. I moved the floorboards 4" forward, added Rivco risers, and have a custom seat that moves me 2" back and 1" up. I'm working on some 7" risers right now to finish the job. In hindsight I should have moved the floorboards 6" forward as I am all legs with a 40" inseam.
R3Owners
Jester 76