RE: proper set-up method
from the pics your car is "too low" put the wheels on it, drop it a few times and roll it back and forth to let it settle.
add shock spacers to get the rear arms so they are level with each other....
fronts are usually a bit ablove level ( at the diff case )
now... when using your set up jig, you need a smooth surface so it slides.
start with the rear and set your camber. you can use the protractor, BUT you cant line the bottom up with the piviot point and measure the top.
why? ok lets say you really have 2* of camber.... if you line it up with the BOTTOM and measure the top where your protractor crossed the plexi you made,
you will end up with 4* of camber...2* out aut of the bottom and 2 at the top.
that piviot point of the protractor will have to be in the CENTER of the wheel hub, be level and then you can see how far from 90* it is.