Rear camber is more complex,
Dont bother touching it if you don't have to,
Bare in mind, that scoobies and setup to grip on the back and let go on the front, so the back is already setup to grip well!
You are just adjusting to have more grip at the front to either balance the car out, or at 3 deg neg, she'll bite in so hard on the front that the back lets go handy enough, very scarey if that happens when you aren't expecting it, (I always expect it)
Stick with 1.5 at the front for good balance!
Dan