I had a '91 750 similar to yours. I had a Fox Racing shock and Lindemann Engineering forks all well set up for my weight. Stainless lines, well-maintained brakes, nice pads. JE 955cc piston kit, RPM adjustable ignition trigger, Dyna coils, FactoryPro jet kit, tuned on the dyno - around 123 DJHP. In other words, the bike had been steadily modified in an effort to keep it current and capable over the course of the 16 years I owned it. After all that, it would run with modern 600/636s, get pulled significantly by '02 and later 750s, and positively looked like it was tied to a post trying to run with a modern 1000. Then I spent a bunch of time on my pal's K3 1000. I was ready for the power - which it had in spades. But the urgency of the power with the light throttle and fuel injection took some getting used to in order to be smooth. Plus, the overall feeling of the bike was like it was carved out of a big chunk of billet aluminum - light, solid, substantial. Going back to my oil-boiler, it was smoother but heavy and slow and the only way to describe the handling/suspension/chassis is what I said at the time: "crap this thing feels like it's got a hinge in the middle of it".
So I bought a K7 1000.