Lucky you.
I only sunk it once in 1940 I think when it was traveling alone from USA to Britain, or vice versa.
After that, in 1943, I had a frustrating patrol in which I met her in a convoy, got into perfect position, launched 4 eels... .... .... now the timer started ticking beyond the red line..... nothing

I considered manning the deck gun after that.
Enjoy your renown, you will need it with all them upgrades, by the way did you get the snorkel already?