On D I usually don't drop further than 25, but it hasn't mattered in that regard what combination I use with STHan/Phasma & RG. Lots of Rey/QGJ combos in our shard. I started in early December, so its a fairly mature one. I think RG is to blame for the stability though, because if the opponent goes after Lando early, RG gets a turn quickly, and that means someone's getting stunned. That's also the reason I've been using Han's leader ability.
BTW, How about Lando's life steal? Lmao. I ran into a match yesterday where Rey and QGJ both went after him, leaving him in the Red. This particular team was also running 5's and Dooku, so when Lando's turn came up I sighed and reluctantly hit the special button as I've no healer in. To my amazemant the life steal put him in back in the green, and he survived the counters from both 5's and Dooku. Next time around it was the same thing. I was in disbelief...