My personal opinion about ballance:
If you try to make historical ships - they will weight 10000-15000 tons more than in real life. Armor also weights too much now, making it impossible to build a ship using turtleback armor scheme, especially with with increased weight of bulkheads since Alpha 12. Quad guns weight too much (since Alpha 11 I guess). Quads must be much lighter, but must be jammed and destroyed much more easily by comparison with twin or tripple guns. This will make them ballanced and fun to play.
Bugs:
All my progress in Naval academy is reset. When you try to type the values in main gun horizontal armor - it can mess (you typed 457mm for example while it sets to 2400mm)