You dont need your arches rolled IF A) you have an offset of 45mm or higher and B) you are planning a stretch on the tyres. I have coilivers; one of the lowest sets on the market FK highsport silverlines and ive also got 215/35/18 and they don't catch, no where near catching.
The only thing though is when I first got the coils I put them has far to the ground has I thought I could? there was still about 8 threads left
when I put it back on the ground it looked badass but it was undrivable
the tyres although they didn't catch in a straight line on corners they nearly pulled the wings off
the subframe was catching on the slightest wiff off a bump and I could not get near speed bumps cos the front end just wouldn't get over them.
So far has to go I got to the bottom of the street and turned round and came back
managed to get it in the garden and put the coils up so I could at least not worry about catching any stray slugs going over the road.