Unsprung weight isn't a big deal if you run on smooth surfaces. Arm weight can be considered 50% unsprung since the inside of the arm barely moves, where as the ouside of the arm moves almost as much as the wheel/tire/hub.
The axle height is always going to be dictated by the diameter of the tire being used...the height will always be half of the outer diameter of the tire. Changing the location of the axle in the carrier won't change the angle of the axle coming out of the outdrive for that reason. It will change your roll center, though.
I've always liked the suspension design of the X20. I really wish that this new version would have gone to an MMX/R12 type of motor mount and top deck design with both belts on the electronics side of the spur so that the spur. Maybe they'll do that for 2022.