Massive caster variance Side to side

Negative camber like that is not a problem with radial tires. You will likely have even wear if you do corner a bit.
Glad you got it worked out. The washers/spacers is not a problem....it is fine tuning the car to get to where you want to be.
There is a direct relationship between caster and camber. It is probably impossible to have zero camber and a high level of camber, at least with stock control arms with these cars. You have to take some negative camber to obtain a high caster number. Aftermarket control arms could get you there but why? Zero or positive camber will not handle as well.