Hmm Always shooting to the left sounds like the dreaded AoB problem.
Are you sure you have the AoB selected correctly. This is a common confusion.
Angle on the bow is the bearing FROM the target ship ship TO your submarine.
Imagine yourself on the bridge of your soon to be doomed target. Where is your submarine? That is AoB. 38 degrees to Starboard for example.
From your target to you. Never from you to the target
In any given situation your submarine will be either to the port or starboard of your target.
So, if you, on your submarine, look to port and see the starboard side of your doomed target what is the angle of the bow? It will be xxx degrees Starboard... even though you are looking to port, the angle on the bow is from the target.
The soon to be doomed captain is frantically looking to his Starboard to see your death dealing submarine.
When setting up the shot in the TDC make sure that not only do you have the bearing from your target to your sub right, for example 038 degrees relative, make sure you have the TDC set to the proper "side" Port or Starboard.
If I had a dollar for every time I had the AoB set at the wrong side (Port when it should have been Starboard) I would not have to be in the navy sinkin ships
Try that, if that aint the problem, come back and I will make up another solution for you.