Hi few things i have to share in my opinion to change
1 capture maps - increase cap from 1000 to 2000 points (most of the ships cant even start fight when its already over)
2 carriers - increase 5k hit points; reduce 5knot speed; increase 20% AA defence
3 destroyers - increase 5 knot speed; reduce range of guns to 50% of batlleship same tier; increase 25% rate of fire; reduce dmg of main turrets by 70% vs battleship and 50% vs cruisers (remember this is recon ship with main waepon torpedos)
4 cruisers - reduce range of main weapons to 80% of battleship same tier
5 battleship - increase top speed 4knots; increase damage by 35% or rate of fire by 25% (this is slow ship and should be able to destroy same tier cruiser with 2 gun salves long range and 1 in 7km and closer)