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I have been using 160 rotors at the back, had no issues with clearance yet, but i have been running them slammed all the way back. These rotors are some generic avids, that came with china bb7's.
But i have the same issue as you, on a different bike, just on the front, i just added a few washers until it stopped rubbing, tightened the caliper bolts more than usual, seems to work fine. Im a master of dodgy setups. Hope thats helps.
Do you find the fore-aft movement of certain calipers is limited by the frame? I have Maguras on mine and the calipers can't be pulled back far enough when I change to a smaller gear, making braking a bit shitter than normal. What calipers are these? Shimano something