Looking around through the game mechanics I noticed a huge problem that I'm going to test. I noticed that most or all DD's have 25cm(9.8 inches). Looks like someone wanted it to be impossible for Uboat deck guns to sink dd's.
Battleships have 90cm(35.4 inches)
. I'm going to balance everything and test this. I noticed there was a problem while testing a Bismarck against and air raid and I took 8 bombs with minimal damage.