Dont forget that with TM 1.7.6 the armor level on the sub has been reduced... crappy planes or not the zeros still shoot my deck crews and one lucky float plane s.o.b blew the port side of the torpedo room out...
Always crash dive (if you can) as soon as you get a radar report, if you cant go below periscope depth due to damage dont waste the effort, just get ya gun crews ready and man one yourself
and send tojo to a fiery death!