Can anybody give me advice on the last cls tier?

Im stuck.. i have everyone at level 85, R2 gear 9 2 away from 10, luke leia and sth all at gear 8 but needing a furnace to go to gear 9. All i need is for some furnaces ro appear in shipments so i can level one or 2 up to 9 and i think i can clear it. I have 5 star mods on all 4. I have gotten down to 2 guys left on round 3 but that is the furthest i can go. Sucks i worked hard got ob from not even unlocked to 7*...then finally beat all the other tiers, just waiting on furnaces now.