Playoffs - Need Roster Help

Started 9-0 and fell backwards into playoffs at 9-4. I need help to see if my roster is enough or what moves I need to make.

QB - Rivers Goff (had smith but dropped him)
WR - Diggs, Hopkins, Watkins, Crowder
RB - Hunt, Gurley, Gordon, Ekler, Darkwa, Duke Johnson
TE - Ertz
DST - Ravens
Kicker - Lutz

I have somve wiggle room between Darkwa and Duke Johnson. Do i need to drop one for a WR and if so who should i drop. Only options are KB, Goodwin, Doctson, or Wallace. I have the bye so this is week 15&16 only