Job pick for fast Expert/Level Cap roulette farming?

So, let's say I want to farm Heliometry tomes quite fast, which of those 3 options would go potentially faster with random groups?

a) Pictomancer
b) Dancer
c) Alternatively going as a healer with Sage

I've noticed both PCT and DNC, even though not the top single target dpsers, can pack a punch on trash pulls, but I couldn't determine which one brings more. I had the impression that it could be DNC because their AoE hits more reliably than PCTs, as depending on how the tank is placing the enemies out.

*I also have Ninja and Astrologian at level cap, but I don't have the feeling those are above average on faster runs.