Quick questions about The Feast

[Tachion]

Debuff stacking is multiplicative, not additive, so it's even more than you think. For example, feint(25%) and phantom dart(20%) end up being +50% additional damage taken from the melee rather than 45%. You have the right idea though that people try to line up big bursts for the best chance at securing kills.
At the moment I think only Scholar is significantly undertuned. The rest of the jobs are all playable.