So, last year I finally, after many years of playing, finished a campaign and survived the war at 100% realism including no map contacts. After that I vowed next time I tried I would use h.sie's executable patch.
Some of the things it does I already did most of the time, like only loading external torpedoes in good weather and at slow speed. (well, sometimes I just could not resist a high-speed convoy end-around chase while reloading.

).
But this h.sie patch sure makes you play by the book. Holy cow.
No external reloading except in good weather and slow speed. Can't even reload your internals in rough weather unless you dive to 16m or below.
Now your oxygen works in two parts - what you have in the air and your compressed reserve. Start using your compressed reserve and you have to go back to base to recharge that stuff.
And the darn periscope! Only good below 4 knots now. How will I ever pull off my famed down-the-throat shots on pursuing escorts anymore?

I might be able to pull it off through the blur...
It's so nice for the lazy WO to go up on the bridge now like he is supposed to.
It's also very nice to get a message when you sail into or out of fog/rain.
I'm scared to use my engines at flank speed now.
The only thing I did not turn on was his dud torpedo stuff. The game has so much stormy weather you'd never get a shot off with that turned on.
So, this adds another new dimension to the old SH3 classic. Can't wait to see if the wolfpack stuff works.
Steve