First, the problem: I feel worthless in groups unless we're killing a (single target) boss.

My damage appears to be about on-par with the BLMs and SMNs on a single target, but as soon as there is two or more, I feel like a wasted DPS slot.

Ring of Thorns or Doom Spike spam barely scratches anything, although they are technically the highest potency attacks I have once there are 3 targets, spamming them will quickly run me out of TP, even while using Invigorate. So that's a bad option, but it is an option.

Are there any others?