The group I raid with right now had/has loot go to main job BiS first, everyone has a declared off-job which once no one needs for main it gets distributed based on off-job BiS, and then it just goes to FFA, with everyone guaranteed 1x chest and 1x weapon coffer from P8S (once we beat it aaaaaa).

Loot distribution has been pretty fair thusfar, don't really foresee issues moving forward either. But basically, if by luck someone's weapon drops, they just get moved to the back of the line for their coffer drop.