I also experience woobles with my SGSE 2015, and it is frightening.
The bike is properly maintained, fully equiped with front and rear öhlins shocks/springs and with perfectly balanced and inflated new metzeler tires... and some woobles nevertheless occure in certain situations.
It might usually occure in long curves at different speed from as low as 60 mph, most generally from 75 mph, depending the quality of the road asphalt or bumps. But it also occurs in straight line at higher speed and above 100 mph it's, let's say unpredictive.
The phenomenon is amplified when loaded with a mid size HD luggage installed in the passenger seat with a sissy.
After having experienced woobles at different speed, I have almost lost confidence in this motorcycle above 70 mph despite the fact that it can easily reach 125 mph.
Even with $$$ invested in performance suspension the scoot is subject to woobles, so l guess the motorcycle conception is flawed by design. I never experienced that with my Springer, even at high speed. This is a real issue and I am clueless on how it can be solved. That sucks and it is dangerous, specially here in Europe where highway speed is usually 75-80 mph, even not limited on some part in Germany.