See Red your getting into it now (I doubt you ever got rid of that niggle though).
I sent a reply to what I was playing with and with your new knowledge on elevation, you may be the man to solve this more factually than I can.
Keep us informed and I will do the same for you
This has been a game killer of mine for a long time.
If this is solved, I can then proceed to lowering everything so that Uboat can be instant death in a ramming incident.
Setting no armour on sub and sub systems, makes it possible for the gradual tapping down effect from DC's with lower power settings.