FATE Grinding and Monks/Pugilists

Okay, so this has been happening a lot to me and more than a few others:

During a FATE party grind, we melee DPS classes can barely tag anything before mobs die. They go so quick that most of the time, they're already dead by the time I run up to them (even sprinting).

I had an idea though (which I haven't tried yet): Would Rock Breaker work? It's really our only viable AoE, and while it doesn't have the kind of range that a magic user has, it would probably help in the tagging process and net us Monks some more EXP.

Thoughts? Has anyone tried this, and if so, is it a viable option for FATEs?

I tag just fine spamming Arm of Destroyer, just learn the enemy spawn points. Half the time you're lucky if you can even see all the monsters to begin with to even target. So learn where they spawn and use Arm every few seconds on top of it.