I thought you wanted your car finished long ago. I could do my own alignment, but it takes a lot of time just to get it close. Every adjustment moves something else, and you have to chase it around and around on your back. Even the thickness of the string is going to affect the toe readings, plus you will bump the strings and have to keep resetting it all again. Caster is a very sensitive adjustment needed that you don't find important. That's what fine tunes the steering to get it to track down the road on rails, which mine actually does perfectly with no steering pull. Goes right where you point it. Find a shop that will let you supervise the process and get your car on the road so you can find all the other things you will probably find to fix, I've been painfully following for 8 years and counting. I sat in my car for some of the alignment.
The C4 suspension is nothing like trying to line up a Camaro, or shoebox, which I have done.
Your tires you have on your car are probably well past their prime by now, and flat-spotted all over, and dried up. What tires are you going to run? The car needs to be aligned to the tires you will run, because they can also affect the alignment since it has to be tuned to the tires to be right on.
I run the same size F/R and do not really want to rotate for that reason. They all have different rolling resistances. I have a hunter road force wheel balancer that actually measures it.
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