Welcome to the machine!
I think the 800 seat swap may be the best, with possibly the Meanstreak seat in second place. I considered trying a solo seat and maybe cut the pan to let it sit deeper onto the rear fender. Had a Mustang seat on briefly, it was way too painful for everyone that tried it.
The seat problem became apparent when I adjusted the handlebars back. Previous owner had them set forward quite a bit. I'm going to try moving the bars forward again. My thinking is, your butt isn't planted so hard into the seat if your arms are reaching farther forward, in turn giving your legs an inch or so more.
Another option is highway pegs, or of course, forward controls.