The thing is, you could be using a better mainhand (Twashtar or Terpsichore) and offhanding STP or OA2-4 on support DNC, and improve your TP gain rate to actually keep up with the Waltz timer.

Or, you could gear your Daggers for more damage, meaning things die faster, meaning there's less reason for you to waltz.

Phurba is just hurting your performance, no matter how you look at it.

I'm not sure how I feel about that ability. -40% recast isn't going to pass the balance machine, though.