Hi Brent,
I've had my TR250 on the road for five years, and until recently had the seat in the position that gives maximum legroom; the last notch so to speak. My (rebuilt) clutch has had some issues the last couple of years--replacement of a rebuilt but eventually weak clutch MC, bad plastic flex line eventually replaced by braided steel, you know: the usual. Anyway, a few months ago I moved my seat forward one notch. I'm 5'10" and yes, it is slightly cramped, but I'm able to more consistently achieve the full throw of the clutch pedal, and consequently less often "crunch" on that speedy upshift from second to third. Kind of like those extended clutch slave sylinder pushrods, except this was free.
I don't mean to hijack your thread by talking about my clutch, but my point is that the ergonomic design (or lack of it) of most Triumphs is challenging for many physiques, so I figured if I'm going to suffer anyway, why not make the car work better, too? I now also have slightly better clearance between the stock steering wheel and the tops of my legs. Everybody is built a little different, and of course we all have our own preferences, but I just wanted to mention what worked for me. My Mazda is perfect, of course, but guess which car I drove to work today?
Side note: the legroom on the passenger side is amazing, and always impresses new riders.
Good luck with your car,