left rear shock wants more rebound dampening, right rear shock more compression dampening. and yes the rear springs want to be the 3412002/3 for 3000-3200 pound car.
I agree with this guy. everything should be in the shock settings front and back. also before you change springs do something with the left front shock adjustment too. make sure the setting is completely opposite it is now. stiffen it up all the way and make sure the right front is as loose as it can be.