Single torpedo kills help a lot. Smooth seas and not wasting deck gun ammuntion also seems to help.
I was playing at 51% realism and mostly impact hits for a while and was taking 2-3 fish to sink a ship. I switched to setting manual depth and going for magnetic trigger and am finding a lot more single fish kills.
Latest patrol VIIB, October 1940 to BF15. 92K tons. Sat in the shipping lane and kept getting double and triple C3s, tankers, etc. Emptied the deck gun and all but three torpedos, two fore, one aft.
On the way back to Brest, just south of Ireland, I received warning of a task force and had just seen the lead destroyer and hidden. Managed to drift into the TF, put my two forward torpedoes into a Fiji and sneak out with only superstructure damage. Most of the escorts went running off the other direction so it wasn't one of those long and interesting escapes.
Then I found a lone C3 and managed to snap it in half with my remaining aft torpedo. Set it for 10 meters and hit just forward of midship. I returned to base with 40 star shells and about 800 rounds for the flak gun.
My tonnages for the the first four missions in the type II were 7k-10k. Immediately jumped up to 50k for the VIIB.
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