Although this was a good 15 years ago, one of my friends is
6'5" with 36" inseam and owned a red 1995 XLH1200.

Since he was in the Bay Area, he had Corbin build a custom
dual seat that made a world of difference as the pocket of
that seat was moved back as far as they could. He let
me borrow that bike, and it fit me like a glove as I'm
close to his height.

At any rate, a seat that enables you to slide back more so
than the oem seat definitely helps with the ergos. It means
less room for packing a passenger though.