Date & Time: Since Stormblood
Frequency: Hourly
World name: All, but personally on Brynhildr
Character name: Radical Liberty
Retainer name: Kujolyne, Graebbluom, Filibert, Lero, Rero
Class/Level: DRK 70, GNB 80, SMN 70, ACN 70, DRG 70
Party or solo: Solo
In-game time: Hourly
Area and coordinates: Any retainer bell
Steps:
1. Have a 400+ ilvl retainer between 70 and 80
2. Send them on a quick venture
3. Only ever get loot level 60 or below

Basically it seems the loot table for quick ventures never got updated after Stormblood released.