IMO, give the puffy ack a boost so its actually a deterent (such as increase the density and accuracy, but only let it update the true possition, vector, and speed of the target every 10 seconds), and drop most of the manned guns (from what AKAK has told me in-game, they were slaved to the Radar to improve accuracy, but I'm not sure on this).
If they (the 5" Dual Purpose guns on the ships) WERE slaved to the radar, remove the manned puffy ack entirely, if they weren't (or were only radar DIRECTED) then something needs to be done about them. Perhaps model the inside of the gun sponson, let them look around through the vision slits (you can use your radar to find the bearing of targets, and move the gun accordingly) when they are "unzoomed" and give them the crappy optics that the tankers have to use when they 'zoom in'.