I have a (soon to be boosted😈

2015 Camaro 2LT/RS and am taking my car to an alignment shop to get a useful amount of negative camber to make the car handle a little better as well as allow me to lower the rear with the wider tires. I'm currently lowered on BC coilovers and am running BMR sways front and rear.
Anyone who has experience in this, what would be the best camber settings to accomplish what i'm looking for?
Thank you!