If you have tried loading only the mods I suggest;
TKSS18 German U-Boats Compilation
German U-Boats Compilation 2 (only VIIB & VIIC models by WISE)
German U-Boats Compilation FuMO_Fix_SNS
New U-Boat Guns Fixed Reworked (for German U-Boats Compilation)
Ai German U-Boats Collection (Ahnenerbe)
Using the 4GB patch and also trying to launch the game using the SH3.exe only.
If all these parameters are met, and you are still crashing I can only think it might be a corrupt mod file
Try maybe only loading;
TKSS18 German U-Boats Compilation
Ai German U-Boats Collection (Ahnenerbe)
Try
not using Hsie patch for the moment!
See if this works.