I've got about 650 miles on my PR4s, and have had occasion (and I'll deny it if pressed) to slightly exceed prevailing limits by a couple of mph... (or more). I've hit triple digits once or twice for the express purpose of checking handling (open highway, no traffic, certainly no trucks around). It stayed planted, straight, and true like it was glued to my line.
That being said, I have my forks raised 19mm to match my 3/4" links, and there was a noticeable increase in stability both at speed and in cornering. So, I 2nd greywolf's suggestion... At least as a checkbox...
2017 Pearl White 650[/B]
AdventureTech lowering links and GPS mount
AdventureTech +2" SS braided brake line
GPI spools, SW Motech risers
Givi XS307 Tanklock bag and Givi 46L top case
Suzuki hard case saddlebags