Last Jedi - thats actually a really good point about ben/st han teams. Without plo, you could easily be stuck attacking st han with basics, and handing out TM to their 3 DPS. I'm pretty sure qui-gon's tenacity is low, too. What level are you and are those teams common?
I'm level 75. I'm slightly above the curve on my server. I have not yet seen other toons above 79, but any day now. So my server is pretty young, probably started in Feb or March. And on my server, this is rare. So I've only had a chance to fight it a couple times. It took me a minute to figure out how 121 speed Han was going before all my speed toons except the first one! I don't have a large sample size, so I don't know how common it might be to be able to beat down and/or stun Han without being tripped up by that first dodge, but from other people's posts, the Han bomb seems to be have a pretty sensitive trigger. Because of the instant TM boost when he taunts, and the variability of when it will happen, it seems pretty futile to have just one debuffer and hope that he ends up in a position to debuff Han, quickly.
But Ben's leader ability was only fixed recently. And the change to counter attacks going to the taunter is also brand new. So this combo just recently gained a huge buff. It's people who already happened to have these toons that have found this out. I have heard that on other servers this combo could be in half of the top 20 on any given day.
So this is just something I keep in mind and hope to have an answer to, eventually. As well as my own Ben and Han, of course. :) Assaj might work, but I don't know. I only have a QGJ.
Maybe I'm amped up over nothing. Perhaps a QGJ non lead might be the way to go, then poke Han with a couple of faster toons. If I ever see that team again, I will try some new things.