Wheel offsets

Hello

Got a 72 standard bug running repro 8's and 195/60/15 RE002 potenzas on the rear.

The car sits with slight positive camber, and my friend followed me and said it was pretty bad when driving.

I lowered the car one outer spline which pretty much rested on the bump stops. It handled a lot better but I couldn't risk trimming the bump stops as the wheels were flush with the fender, pretty sure they wouldn't make the tuck.
There good day moulding wings.

So.

Do stock 5.5 steels have a favourable offset does anyone know?
So I can lower it and trim the bump stops? Although I think I'll go half a spline, (5inner and 5outer if I recall)

Cheers
Andy