I like this ship quite a bit. I went with ASM1 to improve Main Battery gunnery. I have only a 10 or 11pt captain on with CE fitted. No AFT, no Secondaries Build. With ASM1 I actually like the shot groups of Bayern's guns and she rewards me with nice, solid salvos, hits.
She has more speed than the USN Standards I have. She can punch through the armor of AZ, etc. with her 15" guns. Unlike my Fuso and Mutsu, Bayern does not fold when taking the first nasty hit. In average damage so far my Bayern is easily eclipsing my Mutsu (despite 16" guns), Arizona, Dunkerque.
A good blend of power, speed, protection at Tier VI. Only issue is when I have to face Tier VIII BBs.