Ok, but what would have been the likely "performance setting" that the previous owner may have used on my car?

The car had the original tires on it when I bought it at 13,351 miles. Sometime in the early 20,000 mile range (I sold it at 28,xxxx) it had worn the inside tread on both rears down to steel cords.
I assume the guy put the arms in soon after purchase, but I do not know that for sure.

I had no idea it had adjustable camber until I realized the tires were worn so unevenly - the shop that put the tires on told me and suggested an alignment. But after checking with those here, I realized I had a perfomance mod. I had the alignment checked, the front was, I think, to spec - but I remember seeing a lot of red in the rear's readings. I wish I'd saved that page.