See how much difference there is in distortion from the fully torqued state compared to the lesser amount you are considering. Also, cast rings will conform and seal to distorted shapes in the bore much easier than a moly ring will, so if you are using moly stlye rings several thousandths of distortion might still be too much for adequate sealing. A moly ring is just more rigid and less flexible than a cast ring is, and they need a more precise bore to ride up and down in....if your running moly rings.
