I wouldn't bother trying to back the set screw out, frankly. We tried that before and it still just isn't a great solution since then you don't have a lot of threads holding the retainer onto the screw and you are even more screwed if you want to try running the springs outboard. If you want to run inboard, run linear springs. For all other situations, raise the crossbrace and run the AE/VBC/whatever side springs outboard with the stock retainers .

If you don't want to deal with shimming the crossbrace, I would recommend looking at the Tuning Haus standoffs as replacements.

I think many of us who ran the car had two crossbraces on hand. One drilled for the linear springs mounted inboard, the second drilled for the normal springs mounted outboard. Makes it easier to try the different spring choices back to back.