Missing at Singapore?

It is in fact not accurate; they are +10 from normal mobs.

Normal 90 mob: 81 acc (9^2) - derived from level 90, (level/10)^2 is the normal formula.
Singapore 90 mob: 361 acc (19^2)

http://www.southperry.net/showthread.php?t=36394

That's accuracy though. Misses would be a result of monster Avoid, not accuracy.
Hidden-Street does in fact report their Avoid as 364 (which I can't verify is any more correct than 361).

Still, again, it doesn't explain why a Battlemages and Dual Bladers are missing.
In your case, you actually have less than the require accuracy, but neither of the other classes do.
I guess I'll drive my Pali out to see if he misses (has over 364 accuracy).