Good Morning Sailors!

I'm a SH3 veteran and i have just begin my patrol over SH5, so im quite new in game features and so on...
This are the mods i'm using now:
Generic Mod Enabler - v2.6.0.157
[C:\Ubisoft\Silent Hunter 5\MODS]
Magnum_Opus_v0_0_1
Shadow Improvement Mod
FX_Update_0_0_19_ByTheDarkWraith
IRAI_0_0_37_ByTheDarkWraith
NewUIs_TDC_7_1_0_ByTheDarkWraith
NewUIs_TDC_7_1_0_alt_officer_wounded_by_Torpedo
NewUIs_TDC_7_1_0_New_radio_messages_German
SteelViking's Interior Mod V1.2
SteelViking's Interior Mod V1.2.2 Patch
Stormys DBSM SH5 v1.3 Basemod
Stormys DBSM SH5 v1.3 HOTFIX 3
Stormys DBSM SH5 v1.3 optional -6db damped Sonarguy
Stormys DBSM SH5 v1.3 optional louder engine sounds
Stormys DBSM SH5 v1.3 optional scary creaks
TDW_No_Aircraft_Spotting_At_Depth_1_1_0
TDW_No_Contact_Colors_1_1_0
TDW_No_Hydrophone_On_Surface_No_Aircraft_Spotting_ 1_1_0
Dynamic Environment SH5 Basemod (realistic version) V2.1
Dynamic Environment SH5 Sounds V2.1
TheDarkWraith_DC_Water_Disturbances_v2_0_SH5
SH5Lifeboats_by_Rongel_TDW_stoianm_v2.11
NOZAURIO'S SKIN (Standar No Emblem) v-1.0.0
MightyFine Crew Mod 1.2.1 Alt faces
Enhanced FunelSmoke1.2_by HanSolo78
Accurate German Flags
So i have a question:
last day I played a 1941 historical mission and there were 2 british destroyers (I think they were Class A Destroyers)

trying to sink me. So, as my experience in SH3 i dive to 150 meters (with depth unter kiel 5 and begun silent running. But that was to easy and i wanted some action and see my sub damaged and chased so I get new depth 50 meters and both electric at full speed

. Surprisingly the destroyers were unable to perform a depth charge run over me.

I climb to Pericope depth and the only thing they made was firing their cannons as they see my periscope and circle around, they dont even try to ran over me.

So literally i was moving almost freely at pericope depth, full speed and two destroyers who seemed more like my personal escort.
I thought that with the IRAI Mod of TDW the AI was more aggressive (almost like SH3 with GWX), so the question is:

Is this beaviour normal?
Do I have some mods installed who deactivate IRAI?
There's a solution for this?
Thank you very much in forehand for helping me and best regards, Warfox.