because something else will be bent or misaligned causing there to differences in camber when they are both set on the same setting.
no idea why your only getting max 2degrees camber.
you need longer lca's etc me thinks.
wait wait wait. did you do the alignment with the wheels of the ground.
and then measure how much camber you got when the wheels were back on the ground?
that'd mess things up alot. lol.