Hey Mr. A... I have no other mods layered in besides OM - here is my OM install setup:
OpsMonsun_V705
OMv705_to_v712
OM_V712_Hotfix1
OMEGU_v100
OMEGU_v100_Patch1
OMEGU_v100_Patch2
OM_Arct_Env
Carotio_IntercontinentalRadioPack
Spaxs SH4 Uboat SPEECH FIX_V8
Csengoi's EnemiesOfGermany
Real Clothes
New Frieghter
De Ruyter
You definitely want Spaxs German speech for the immersion feeling - and Csengoi's EnemiesOfGermany mod is very useful as well (all the different flags to figure out). Holler at me if I can help with anything else.
Good luck and happy hunting, Herr A...