@shouken
Editing the guns in Skwas I noticed a good improvement in accuracy. Try using lower max angles, higher max range, and very high muzzle velocity. Reduce recoil and the tolerences to 0.1. This should cause the guns to shoot flatter and at a lower angle. So even if your gunners overshoot they're still abound to hit something. Your gunners will most of the time hit nothing but water on their 1st and second shots. Afterwards they start to hit almost every time on a large ship that is.
Also, I made a post on how to experience sinking without dieing. This way you can continue to fight even with your bow underwater.
See here:
http://www.subsim.com/radioroom/showthread.php?t=161336