For what it's worth (not much I'm sure), if you're looking for data from game careers my first/best career had my kaleun sinking 85 ships for a total of 437,782 tons over 17 patrols (Sep '39 - Jan '42), for an average of 5,150 tons/sinking - I was playing stock at first and then various RUB versions up to about 1.42 - never used any other mods that appeared to affect ship tonnages, and didn't do anything like harbor hunting or tanker farming or whatever to get any really big ships.
In my second, rather less successful career, I sank 9 ships totalling 57,930 tons, over 6 patrols, for an average of 6,436 tons/sinking - using RUB 1.42-1.43 (first 4 patrols were with a Type IIA, so I was only shooting at the larger targets first and didn't have many fish left or a deck gun for shooting the smaller targets, which probably skewed the average to the high side a bit).
I like the variability of the tonnages to some degree - it was pretty weird that first career seeing how many ships I sank that were all within like 2 or 3 tons of each other - certainly didn't seem very realistic.
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