bisonrav is offering very sound advice. The combination of GUF, 2-4-1 and joker makes EDI-SYD very affordable. I would go F all the way as the avios difference is very little and availability is normally not an issue.

Your jokers don't show on your profile (missing functionality on BA.com), but the GGL line will be able to tell you how many you have. If you haven't used any yet, you should have at least 2.