Trading Rioli or Sylvia in as extra forward and keep Petrie or trade him?

[Madmax75]

My team is:
B Goddard Gibbs Deledio Fisher Broughton Adcock Birchall (Puopolo McKeever Jacobs)
C Swan Pendlebury Boyd Bartel Ablett Moloney (Mzungu McKenzie Rounds)
R Cox Z Smith (Keefe J Tippet)
F BUddy Pav Goodes ROK T Cloke N Roo Prestia (Petrie Krakouer C Richo)

I have finished 4th and hope to win to get thru to the prelim. I have 6 trades left and 280 k. I am thinking Prestia out and Rioli in or another option like Lecras Slyvia etc. Options like Chapman who have the bye coming up are not an option as I want to keep Petrie to allow me to cover Bartel if I have to play a final next week. So he would be an extra prem forward. Also my opponent has him this week and hawks should destroy port. Any thoughts or any other options. Didak would be a thought maybe for Cam R but doesnt quite add up

[Ringo]

With six trades you are well set.

How about this as extra cover and sets up your forwards and mids>
Prestia>Fyfe
Kraka > Rioli

Gives you plenty of options for covering byes etc and leaves 4 trades for back upgrades and allowing Petrie to go to Rucks if Smith Rested.