I agree with JM on a flat piece of road, I know sometimes hard to find but at 15-20 mph solo or 2 up hands off bars my bike tracks straight as an arrow, increasing to 33-35 mph still arrow straight, slight body weight shift will immediately influence direction as expected, they are super sensitive to weight distribution, if tyre pressure and condition are ok and front fork end is set as JM's recommendation, I would remove any additional pannies racks bags ect, if it still drifts left I would be heading back to the dealer.