Yea so this worked for me on Xbox One. Wasn’t intentional mind you merely noticed this afterwards.
- Xbox one settings, network, go offline
- Start game
- Check your Flakker or Firestorm stats
- Go back to Xb1 settings, go online
- Open network in game
- Goto Proving Grounds
- My weapons retained original stats
Basically nerfage only seems to occur if you load the game while online.