This is definitely BiS with the Dreadwyrm Daggers... and until those drop, using the dreadwyrm circlet with the augmented ironworks daggers will do nicely as well:
http://ffxiv.ariyala.com/OMQN (Lava Toad Legs for accuracy)
Kind of glad that nothing but the daggers are a worthwhile drop in the last turn for once >.>
T13 Accuracy caps are:
Front: 558
Flank: 535
Rear: 515
The 548 you are currently at is good up to T12 for the front. Make it a point to shoot for front accuracy caps since T9 since we get to face bosses and adds head-on from time to time.
