You go with the flow. What works best within the narrative?
Goons don't usually fight all the way to the end, but sometimes I'll have goons go up to Milds only, or Milds and Moderates, or only take one consequence total (regardless of type).
Is the fight going a lot harder on the players than you thought? Take 'em out quicker. Fight too easy? Make the goons take more consequences.
Honestly, this is probably the easiest way to adjust a fight's difficulty on the fly.
Also, what killking72 said.