Ok, Im confident now that something is wrong with my game. Its 19 October 1939, I fired about 20 torpedoes so far and only one exploded, the rest is dud. I shoot them at perfect angle, from perfect distance. Every torpedo makes it to the target but bounces. I know there were problems with torpedoes in WWII but its just too much. Heres some screenshots from one attack:
http://i.imgur.com/mgiD5w4.jpg
http://i.imgur.com/Gnhu8Gs.jpg
http://i.imgur.com/JhMyqX4.jpg
As you can see, angle is around 95 degrees and range 1300 meters (other attacks varied from 900m to 3000m) so its a perfect position yet all torpedoes are dud. Heres my modlist:
sobers multi color mod V5
DynEnv v2.9 - 1. Main Mod
DynEnv v2.9 - 5.a Ambient Settings - Darker Nights
DynEnv v2.9 - 6. Sleet for Winter Campaigns
sobers best ever fog V25 SH5
Moon_light_mod
sobers base sky mechanics V1
Water reflections intensity varied by available sunlight by TheDarkWraith
Small_trees_SH5_V1
Equipment_Upgrades_Fix_v1_4_byTheBeast
Equipment_Upgrades_Fix_v1_4_Patch_1
#Equipment_Upgrades_Fix_v1_4_Patch_1_HotFix
Reworked Morale and Abilities v.1.1
NewUIs_TDC_7_4_2_ByTheDarkWraith
IRAI_0_0_39_ByTheDarkWraith
HydrophoneFollowNearestContactFix_For_NewUIs_TDC_7 _1_0_To_7_5_0
OPEN HORIZONS II v2.3.1
DynEnv v2.9 - 12. Sounds
Accurate German Flags
German U-Boat Crew Language Pack
And if I remember correctly, I installed Generic Patcher and of course version 1.2 of SH5 (this was done by Uplay launcher)