After a year or so, I've installing SH3 again with GWX, not a single regret

But there are some things that are are still a mystery to me:
1. I can't escape from destroyers, I mean I turn away and dive right away after I fire my torpedoes, but I got dc'ed and send to the bottom.(literally)
2. Flags, how on earth can you see them?
The red flag of the British is recognizable from 1500m in daylight, but at Night? Sank 3 neutral vessels because of this.
3. Is it me or is changing the depth of the torpedo useless?
I've tested both the standard depth and the Draft +1m, but I didn't notice any change in damage.
4. Can anyone recommend some mods for GWX 3.0?
My career has ended (1939

) So I wanted a fresh start