The car moving a lot during highway speeds definitely sounds like the steering rack issue TSB 12-2-17,
TSB 12-02-17 - Steering issue - New TSB?
Sensors were not programmed correctly in the steering rack which causes the car to wander left and right at highway speeds, while the steering wheel is held straight.
fix: steering rack which is nationally backordered ~6 weeks needs to be replaced.
Mods: Drop in K&N filter, Steeda RSB, MS3 RMM, Remote start, Llumar tint, Ti engine cover, Husky floor mats, OEM splash guards