Well, trainworld.us is pretty much outdated in several aspects.
The lvl58 6.1 / 60 Type 3 AA guns have 27° golden angle like the famous 4.7 duals. So they fit perfectly on Yamato/SY in combination together.
And this is since years i guess.
Don't know much about the other guns - the 6.1 D versions seems OK with 32° GA.