The aoe is is fine if you ask me since anything within 7 meters of the shot will break which is an awful large distance if you think about it.
Are we playing the same game? Since when are the Galleon's 2 heavy guns further away than 7 meters that a barrage that hits one of them doesn't disable the other one as well? Cause that never happened. So it's either not 7 meters, or I'm crazy.
The AoE is much smaller than you think, especially when there is no spread and you can't realy lead your shots properly while firing due to the shake, twitchy mouse movement is also mostly unreliable when firing a volley of rockets and risks messing up the rest of it.
Long range volleys require too much concetration and precision for a multi-warhead weapon. Old Heavy clip spread was much better. 95% will still pretty much make all shots end up in the same spot with sub-atomic space difference between shots.
I still think it's an issue with the gun and not Heavy clip, it's underwhelming for the most part and the long reload time doesn't seem to pay of. Too much risk for not as much of a reward, considering enemy guns will be up long before you can fire again.