Hi again guys,
I reloaded SH3 with all the mods i was used to, except one :
TheDarkWaith_DC_Water_Disturbance_V4_SH3
I sunk two ships and evaded ; I made one save with the ships sunk within 10 kilometers, and one far way later.
I reloaded the first save (within 10Km) : Game loaded fine !!
I reloaded the second saved game : Game loaded fine !!
So, for me, it seems that particular mod is the culprit, BUT :
After reloaded the second saved game, i decided to go over my patrol and sank a few ships ( 3 in another convoy) and an other lonely ship later in the patrol. After that last hit, i saved and quit the game.
Today, i reload SH3 and load that last saved game : Crash at the "Not so long ago "
This time, i do nothing and reload SH3 but i choose a saved game just before the last and : Game load fine

( The state of the game is after the second convoy was hit by me, at about 12 Kms of the ships i killed.
So, i don't know what to think .. Things are definitely better for me without this particular mod, but not "perfect"
I will continue testing but it takes so much time !! But i just don't want to give up, not yet
The next mod which i will remove is " TheDarkWaith_Ship_Plane" and see what happens.
Next ship i sink, i will stay within visual range and save the game.