Hope you get it sorted, I know how frustrating scrubbing can be since I fitted TT lower arms I've had a right headache with arch contact 
thanks man, i really wana get it sorted as i love my 3sdm wheels on atm and i dont really wana get rid of them for the sake of a damn arch haha!
iv been having a look for a while and im reading that it can be done and other people are saying to have the arch cut and then a wider arch welded etc which sounds like way too much work! haha