PPR - lots of tough choices to make this week. Could use some help!

RB (2) - Fournette (@CAR), Mack (@KC), Melvin Gordon (DEN), Coleman and Brieda (CLE), Darrel Williams (IND), Wilkins (if Mack is hurt)
WR (3) - Set with J. Jones, M. Thomas, R. Woods
Flex - Whoever doesn't start at RB, DJ Moore (JAX), P. Dorsett (@WSH)

I currently have Fournette and Mack starting with Moore as my flex, but I hate how he's performed without Cam. Do I roll the dice with Melvin Gordon, despite a snap limit? If Mack is injured, do I play Wilkins, or give that spot to Gordon and keep Moore? Lots of variable here.

Thanks all.