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The problem is almost certainly that the distance from dropout (axle) to fork crown (A-C distance) is slightly mismatched. The solution is to match them. My method is to add a touch more fork offset on one side, which shortens the A-C on one side, and "pulls" the wheel back up to center. After tha I touch up the dropout parallelism as others have stated.

I've done this for many forum members with good success. It takes some very specialized tools, and I made my own fork reraking tool which only touches the fork blade, so no extra stress is applied to brazed points (fork crown and dropouts).