[2019] Secondary Sinop

I wrote an answer, than came upon one intresting thing about accuracy and had to check.

It may be suboptimal, and I wouldn't recommend it, since to use it, you have to show more broadside than Nagato and your citadel isn't as low-postioned as on Gneisenau. Also, Gneisenau has more range and has built-in IFHE.
Nagato can fire 8/11 secondaries at 10 degree angle. Sinop 6/8 at 14. And Gneisenau 4/6 at 33.
Firing angles, Nagato, Sinop, Gneisenau, from Gamemodels3d. (don't look at secondary accuracy there, though, it's parsing stuff wrong)
What was unexpected for me - accuracy of 140 mm battery for all IJN BB — Nagato included — is higher than normal and similar to that of Massachusetts.
So, secondary setup for Mutsu, Nagato, Ash*taka, Amagi and Kii is more viable than at first glance. And may even be a reasonable alternative to other builds, if we don't consider armor scheme (IJN BB can be squishy), so if you try that setup - you should know what you're doing, as this is quite bold and risky. And if you go higher in line - you'll have to retrain commander to different skills.

I have Nagato commander with secondary setup and have used it on Kii. While it's fun as it just melts enemies with 100 mm, on higher tiers 7.6 km range for seconaries isn't enough, especially combined with IJN BB concealment, so I stick with other builds.

It shouldn't, since

And I had to check internally for secondary accuracy. Just in case, Warspite also do have increased secondary accuracy, but that was common knowledge.

They did, and HE pen is shown in the port.

I fully agree, I use AFT almost on any BB as a part of "universal" build.

And here I thought that among RN BB's Hood had quite decent secondary dpm, and with her speed, she can shase enemies down.

There is. Though it would better and easier for everyone to at least show some screenshot ot the situation you're describing. Or replay.

But I'll try to check.

Thank you, Intresting stuff, especially with Alsace. Will look into it.