In my experience with shaft driven bikes with lots of torque the rear suspension lifts when gassing hard losing a bit of traction vs a chain set up squatting. With the lighter build as it is now, it makes me wonder how much easier the rear would brake loose around a curve.They're probably running a stock Goldwing swing arm because it's driveshaft driven. Just looks odd without all the bulk.
Also, true story about the gearing, good point... I'd like to see where the gearing stands to see how it needs reworked.