That's quite tough. If it helps I can tell you I'm 90% sure I'm getting rid of Setters this week for ROB. I'm not sold on the possibility he's a straight in when he comes out of suspension and he doesn't score well anyway. In other words you may be banking on Setters providing cover when he returns but 2 weeks is a long time for a marginal player on a bottom-feeding team. Having said all that I don't own Butters but if I did I would probably look to move him on over Setters given Butters is much closer to his price peak. In other words I think trading out Butters is a very acceptable route.
Note I do have Miers and I view him as good cover/probably starter over someone like a Parker.
Gibbons is a terrible scorer so I can understand the appeal of getting rid of but swapping him for ROB or Stack is just too sideways given Gibbons should (slowly) rise in price. Scott I would definitely keep.
Not sure if this helps any, but good luck with the direction you choose to take.
Edit: BTW, nice team.