I forgot to mention that the SCC Shur Grip Z cable chains are suppose to work on Subarus with clearance issues. I've seen a pair of them on display a while back and they definitely take up a little less space behind the tire than my chains. If I can get away with the Peerless Auto-trac chains in front on stock 225/60-16 tires, the Shur Grips should do better.
Now that I've already bought the chains, I'm not going to bother trying to get a set of the Shur Grips. It'll be too much hassle trying to sell a used set.