Have to chime in on this.
I don't have a fork brace on my 2013 650. I've been in *very* high winds over the last couple of weeks, gusting up to 40mph, while that tornadic storm passed north and south of Atlanta.
Perhaps the 2012+ handles a bit differently than ≤ 2011 models, due to the stiffer fork configuration, but it handled SO well, I felt it had a built-in gyroscopic self-correcting script. I had to make ZERO conscious corrections. Is this an anomaly, or am I just sub-consciously correcting.
For the OP, I would definitely re-visit your installation. Remove the fork brace, and take it out again. See if the control is back. If not, and if you loosened the pinch bolts during the install, I would suspect one side may have slipped just a bit...
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