Shots Fired: A Machinist Guide

[Mizore_Canaan]

I believe it's better to keep the AoE turret up and switch to single target at that point.

Promotion Rook: 30 TP per 3 seconds, over 30s is 300 TP, which is enough for 2 Grenado Shots. That is 240 Potency x # of targets.
Bishop: 60 Potency per 3 seconds, over 30s is 600 Potency x # of targets.

To add onto that, 30 TP per 3 seconds with the natural 60 TP tick results in 90 TP per 3 seconds, meaning 360 TP over 12 seconds which is 240 Potency x # of targets.
Bishop Turret would have 240 Potency x # of targets over 12 seconds, so it doesn't really matter I guess.

of course since most aoe'ing is done in party content you must also consider your party members, so TP regen might net more dps if say your other dps was a DRG or a NIN, were as a BLM won't need the tp :3