We are running the same wheel/tire setup and pushing 610 to the rear wheels. It all depends how violent your car launches and how far it squats during launch. A really "squatty" launch will have a lot of negative camber and less tire contact with the track. Running some positive camber, even if it was just .25 degrees would be ideal for a track-only car but handling will suffer on the street.
We have run between 1.54-1.56 60 ft/times 4 different times on 4 separate tracks using -.5 degrees of rear camber. This is just our street setting and I'm sure we are probably seeing some excessive negative camber off the line but on a prepped track we have had zero wheelspin so there has been no need to adjust it any differently....so far
