DRK's train left the station: Dark Passenger is in or out?

[Jukebox12]

I'll normalize my Mana on a basis of 1 Syphon Strike. 1 DA = 2 SS.

This is why we compare DA+SE to Delirium, and not to Souleater. If you don't Dark Arts your Souleater, you should be using Delirium - hence +120 potency for 2 SS.
If you don't cast Dark Passenger, you would instead do nothing, hence +150 potency for 1 SS.
If you don't Dark Arts your Carve and Spit, you would instead use Carve and Spit without DA, hence +350 potency for 3 SS.

Averaging these out as Potency per Syphon Strike:
DA+SE = 120/2 = 60
DP = 150/1 = 150
DA+CaS = 350/3 = 116.7

Ergo, the priority is /always/ DP > DA+CnS > DA+SE.

You should prioritize keeping DP on cooldown.

is it worth using delirium if you have a monk in your group or no
what do you do if you have a monk in the group