IMO; the IX class is a bit sluggish, and a sonar magnet. I might void the deck gun argument after a certain point in the games time not to mention a sub is a poor gun platform to begin with. Also jmpo but the agrivation an IX gives you is not worth the 6 or so extra fish.
If you feel the need to kill time and do IO or East coast time knock yourself out, but I'd rather do more patrols in a shorter length of time. Getting into the air gap is about as far as I care to go, maybe the Med.
Type 7 forever
