Ok my career is going well, i've completed 6 patrols, and received 3 CMOH, and a silver star, plus I've been promoted. It's currently april '43 and i've still got a bathtub on my Gato. according to the info in this post
http://www.subsim.com/radioroom/showthread.php?t=134913
I should have the late war or at least a mid war conning tower. (sorry dont mean to grip just getting fustrated)