gs_fMinQuality seems to effect not whether you get a common/rare/epic/legendary type, but there is an additional quality within those types. gs_fMinQuality effects the quality of the item within that type, so whether you get a better or worse common/rare/epic/legendary type.
How to use this cheat table?
- Install Cheat Engine
- Double-click the .CT file in order to open it.
- Click the PC icon in Cheat Engine in order to select the game process.
- Keep the list.
- Activate the trainer options by checking boxes or setting values from 0 to 1