Who to drop for Ty Johnson

Having a hard time figuring out who to drop for either Ty Johnson or Kenny Stills. I have pretty good WR depth but I have a bunch of crappy match ups. MY RB depth is pretty weak too. But the RBs I have have some potential to get me points. This is my team below. What u guys think. I’m leaning toward dropping crowder, Singletary or Montgomery. Bengals offense has been terrible for Mixon but I can’t get myself to drop him. I’m currently 3-4 with this team :confused:

I dropped Montgomery and hoped Singletary could become something.
I still hope so.
Monty got picked up in a heardbeat so i guess some ppl think he can evolve too.
Is it ppr? In standard id drop crowder