Thread:Cookie-san/@comment-26247760-20150908220735/@comment-26348726-20150910005834

Yup, yasen power is "夜戦威力", and does not differentiate between FP and torp. Now that you mention it, I see it too :O How did I not notice that before... Yes you're right, it seems that improvements to AA guns do not increase yasen power. And since any increases in the daytime FP and torp stats would not translate into much battle performance for DDs (the main users of AA guns I presume), it would appear that the main advantage of improving AA guns would thus be its increased equipment AA bonus (both individual and fleet-wide).

Just checked the source citation on that page (http://jbbs.shitaraba.net/bbs/read.cgi/netgame/13745/1400461230/896), that definitely confirms no yasen bonus.

Equipment AA bonus is still easily the largest factor in AA (and thus, number of enemy planes shot down) though, which means that you should still consider using a highly-improved AA gun for air-heavy maps. After all, stat contributions from AA guns are 6 times more heavily weighted than a ship's individual AA...

(Of course, the problem with AA is still the pure RNG factor -_- 50% chance of success for both AA rolls on each enemy bomber slot...)