Hi, 6DL/Garuda claw monk here. I just switched to summoner.

Monk has the lowest dps right now from what I've seen in the primal fights and the first turn of Bahamut, they also require the most work to maintain their max DPS, which is below DRG and all of the ranged classes.

Also shoulder tackle has stun tacked on to it, which means you cannot use it in most fights due to the tank needing to time stuns due to the 3 stun Diminishing returns.

They might do better as they scale with level 90 gear, but that's far off.