R1100 GS relevant?
I owned a 1998 R1100GS, not the 1150. But I had it for 8 years, 72,000 miles, took it up to Prudhoe Bay, down into Copper Canyon, across the country and all around the western U.S. I loved that bike. But my F800 will easily do all the 1100 did, and more. Yes, it's probably not as stable on the Interstate playing with big rigs in crosswinds. But off pavement it's in another league entirely. And after having my final drive crater on me (and take the transmission with it), I'm happy to lube and adjust (and replace) a chain every once in a while. From the description of your riding style, I'd say you'll never look back.
I'm tryin' ta think, but nuttin' happens!