1.5 PPR - for playoff position, could use some help with my lineup

QB: Aaron Rodgers vs Chicago
RB: CEH @ Tampa Bay
RB: J.D. McKissic @ Dallas
WR: Ridley vs Las Vegas
WR: Godwin vs Kansas City
TE: Waller @ Atlanta
flex: Mike Davis @ Minnesota
flex: Wayne Gallman @ Cincinnati
superflex: Tua @ NY Jets
K: Sanders
DEF: Pitt

Bench
Bell @ Tampa Bay
Ballage @ Buffalo
Gus Edwards @ Pitt
Agholor @ Atlanta
Sterling Shepard @ Cincinnati
Tim Patrick vs New Orleans

I'm really not certain about my starting RB's and flex plays this week. I'm not even sure Tua is a safe bet.

Should I bench CEH and slide up Davis or Gallman to the RB1 slot and load in a bench player as a flex? And depending on CMC's and Ekeler's status this weekend, is that player Ballage, Gus, or one of the receivers?

I'm projected to win, but my opponent has some guys that could blow up.