How to globally scale the Pyro sim

I accidentally scaled my entire scene down, but my existing Pyro setup (made using a Pyro Emitter tag) is now far too large and no longer fits the resized environment.

When I try to scale the fire/smoke volume down, the simulation looks terrible

Basically, how can I adjust the fire's size proportionally so it looks exactly the same, but smaller? (globally scale the Pyro simulation)

Any help would be greatly appreciated