First of all check your weapon. Most of the threat/enmity you generate comes from your weapon. What lv are the archers? Or any other DPS as a matter of fact. Even if they are synched, they still have better status than you and probably will generate more enmity than you can. What you wanna do is start with shield lob, flash, then work on your combo and flash once in a while when dealing with 3+ mobs. Archers are kinda to predict since they like to start shooting even before you can do anything, its like a BLM FLAREing a pull even before the tank can flash/overpower once.