16 battleship caliber guns is a LOT - especially when it comes to HE spamming.
When something has an easy potential to be way to good, we will often buff or nerf it slightly at first to see how it is affected.
Mecklenberg, for example, has the same number of guns with significantly better accuracy, but has 305's with the low damage characteristic of German HE. It's harder for that one to "run away" balance wise.