I have 18x9 +18 in front with 215/35 tires. They poke just nice.
Rear have 18x10 +20 and have atleast 3 degrees minuscamber. Tires are 245/35.
No rubbing at all.
All arches are rolled and slightly pulled. Also inner archguards (i don't know to word - plastic things inside arches) are fully removed.
And electrical-harness (right word? motorharness? All wires and cables) is relocated upper inside the arch, so it tires won't rub it broken...