Damn, all this SH5 mod compatibility thing is friggin' hell!
So my config looks like this now:
Generic Mod Enabler - v2.6.0.157
[D:\Silent Hunter 5\MODS]
Accurate German Flags
Dynamic Environment SH5 Basemod (realistic version) V2.1
SteelViking's Interior Mod V1.2
SteelViking's Interior Mod V1.2.2 Patch
SH5_7A_Conning_Fix
Equipment_Upgrades_Fix_v1_4_byTheBeast
Equipment_Upgrades_Fix_v1_4_Patch_1
#Equipment_Upgrades_Fix_v1_4_Patch_1_HotFix
Eqp_Upgrades_fix_v1.4 dates by sober Patch V2
FX_Update_0_0_19_ByTheDarkWraith
MightyFine Crew Mod 1.2.1 Stock faces
MFCM 1.2.1 OPTIONAL crash_dive workaround
MCCD_1.04_MFCM_1.2.1_compatible
Reworked Morale and Abilities v.1.1
Stormys DBSM SH5 v1.3 Basemod
NewUIs_TDC_7_1_0_ByTheDarkWraith
Manos Scopes-patch for 8x5
IRAI_0_0_37_ByTheDarkWraith
OPEN HORIZONS II_full v2
OHII v2 Mission Fix WA
TDW_Mines_Subnets_Detectable_in_hydro (OH II v2)
OH II Minefield map for TDWs Ui
Trevally Tutorials - All v0.2 (for TDW UI)
Trevally TDC Help v2
Trevally Harbour & Kiel Canal Pilot v2.9
If anybody sees something strange in this list -- don't hesitate to mention it. I'm not even sure all of the above is actually working. Kickstarting TDW's 'NewUIs' was the biggest pain in the @ss so far.
And my rig isn't too powerful (Phenom X4 945, 5GB RAM, GeForce GTX 460 2GB), but I didn't expect SH5 to stutter THAT much with maxed settings...
UPD
And where did my tooltips go? Without new UI I could point, for example, a periscope while walking inside the boat, and a tolltip with description would pop up -- now it's gone.
UPD2
'tolltip'

Funny typo. But 'girlfiend' is still my favorite.