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I used bolts (Eibach) one year and the threads stripped out from the repeated adjustments. They never failed except for that. This year I just plan on using a tire I can flip on the wheel so I can participate in FS all year.
I wouldn't want to use the aftermarket bolts for two reasons. First, I don't believe they are legal in FS. Second, I do HPDE's and would not trust their staying together under that stress. I have seen the aftermarket bolts come apart on the track. It's not pretty when they do.
However, I really want the additional camber. Since camber plates are not legal in FS, my only choice is the Ford bolts.
You may be able to eke out a tiny bit more negative camber by taking up every possible bolt to hole clearance in the direction of more negative camber.