Yeah, I find that strange too, they load in any weather, but no deck gun.
BTW, I had a beautiful cruise through Scapa in my new career, there were the aux CAs as expected, entered from the right flawlessly, and the DDs and Flower corvette were WAY far from the course, matter of fact, one DD parked nearby at 0 knots after searching so I greeted it with a torpedo, it missed, but the sucker exploded right below it! It got to 15 knots then settled by the stern. I would have bagged 2 aux CAs and a DD plus merchants on the way in except I did not pay attention to flooding in my stern torpedo room.
I have also noticed that if you do NOT achieve your primary and secondary goals, you only bag 100 or more points vs 500, no matter if you hit ships along the way.
2 things I dislike about SH3 vs SH2, crew management (is for the birds, not a daring C.O. like me) and in SH2 if you went full or flank for too long, your diesels could become damaged and need repairs. Damage to engines VERY bad for subs says Miyagi.
All in all a very outstanding game though.
J.C. before it took me the 5 patrols to get my 7 boat, this time 6, even though I sank more ships, but they are smoking crack if they think I'm going to try to take a dugout to AN16 in a dugout canoe in the early year of the war, that's for the type 7 boats!