Heavensward accuracy cap

[Ditto]

I have around 525 accuracy, sometimes even a little less. Haven't noticed a miss on anything so far, including Bismarck EX.
Could just be really lucky, dunno.

But I am a Dark Knight too, and Grit gives me an extra 5% chance to hit. Dunno if that's applied directly to your accuracy or not, never payed much attention to it.