Will probably be faster to run multiple runs on unsync though, unless you have a static raiders level of 8 players to run min. ilvl.

On the side note, from what I've observe so far,

A. Dungeons drops directly to inventory.
B. Ex primals / coils drop one into the chest, needs to be roll against party.
C. Towers (CT/ST/WoD) drop multiple into the final chest, needs to be roll against your own party.

None of these are 100% drop rate, and only primals/coils will have 100% drop rate if you run it on min. ilvl. (According to the Orchestrion Log, that is)