It's the sim file on the uboat's folder.
SilenthunterIII -> data -> Submarine -> subclass you want -> subclass.sim
You'll need S3D to open the file.
Inside, explore the nodes like in the picture:
The correct value for the IXD2 draught would be something between 5.5 and 6.
This picture below is my settings, with draught of 5.8.
Any doubts, contact me via PM!
