User blog comment:Hayashi H/Advanced Equipment Guide/@comment-3563508-20160110170756/@comment-26486243-20160322075427

Support shelling is affected by neither overweight penalties nor fit bonuses.

12.7cm HALMs actually end up being 2nd best in many cases when your DDs face any form of air threat. Upgraded Poiguns are strong but have no AA effect; because of the taiha potential from airstrikes on DDs, it might be better to reserve upgraded poiguns for use on maps with limited/zero air threat. Upgraded Akiguns are the best of all, but are very hard to get.