Do you have any other set of tires/wheels for this car? do you have any friends with a subaru? (or similar car with 5x100 bolt pattern) You might be able to borrow a set of wheels/tires and go out for a quick drive. eliminating the same tires n wheels from the equation is a quick way to solve this one way or another. You'd either have a bad tire/tire wear issue, or else an alignment problem for sure.