1.Regular BS turret=the turret can handle ANY situations...
2.because of regular BS turret can handle any situations...using motars and BR is kind of dump..lost their value..
3.Heavy weapon takes tons of energy and it sucks at damage..this cause Full regular BS turret=pwn all..
so here is my sugguestion..
BS weapon have 3 type..
Main Battery----Long range (4~5K). slow fire rate(0.16 ? that's 6 seconds reload time)...high speed for its shell (about 3K/s maybe?) slow turret aiming speed (for Iowa Battleship's turret..is 12/s..just a example..need some more test in game to see how slow the speed is..) of course..huge ass damage...
Secondary turret---med range..like the regular BS turret we have now..but lower the damage abit..like a cruiser gun would be good..
close range flak turret....fast re-fire rate..med explosion radius..short range..small damage...(like a missile...but with different animation...
and last thing..Battleship should have huge cargo space (at least 2000) and weapon takes up cargo space (depends on what weapon..if it's BS main Battery it should take alot of space..if it's flak turret should only take a little space) but doest use energy..this will make more battleship weapon combinations possible..(not like now..full regular turret pwn all because it use so little energy with huge damage output..so weapon like BR and motar become garbage)
(PS: Iowa battleship modern version has AA missile launcher..has CIWS(Close In Weapon System) has Tomahawk missile launcher...but i dont think long range missile type weapon fit disco..ppl seems to be like more perfer guns....)