Language can be a stumble, that is for certain... lol - but the bottom two pictures I link to above are the Tambor, Dec 9, 1941 off of Pearl, and they are symmetrically mounted, both fore and aft, as well as on the conn, near as I could tell. The Porpoise is like the Stock game, using the port and center gains for the aft mount, but the fore being fine. I have not found clear enough images yet to determine "proper" mounting for the aft yet, but I do suspect it is supposed to be the outer pulleys they attach to, as you mention - unless they also used a center cable for a time, such as the S-Boats did...
Edit: Have you checked the Sound mods you use? Look at their Sound folder contents, and compare them one to another, to be certain you are not over-writing a sound file you want to keep.
