Thanks! That's why I was wondering. I run the 430# class.I've not done this a heck of a long time but its my opinion that you do it the same each time whether it be with or without the driver is the important thing.
As the drivers get heavier the more those setting change when they get in the kart so with JR drivers its less important to be in the kart. I cant get my drivers to sit still longer than 10minutes so I only scale with them in the kart for % purposes and caster/camber/toe is without them.