I maxed out the rear camber. It was at 1.5°, Now at 1.85°. My autocross rear tyres were barely scuffed on the inside, but we'll scrubbed on the outside. I slightly backed off the rear toe setting when fixing that after the cambering.
It's quite easy to adjust front and rear toe and rear camber.
My car was bit looser than I'd like, particularly on slaloms. I suspect more roll than rears could cope with. Before I saw the wear pattern, I was going to put the rear ARB back to stock. I added extra holes to stiffen it 25% last year.
Next event is next Sunday.
I think I've worked out how to build some shocks that will help me to dodge those pesky cones, but without the bonus feature of breaking my teeth on the way to work. Time to do some maths.