Honestly the opening post could be any of Lumi, Beq or Maul teams, they are all pretty variable, though Lumi being by far the worst.
The raid is heavily rng and it is frustrating, I miss the relative predictability of something like SBR where high scores could be done very consistently, though I do like that you can "overscore" in Endor raid.
I've gone the way of making a R8 B2 lead sep/sith team which is auto-able for max score, Gungan which again is an easy run, QA, MQG, POW, R2 at R9 tier which can take a couple of attempts to get started right, but as soon as you get a decent start to wave 2, you are certain to max run.
That leaves Lumi, which is the worst RNG fest there is and Beq which is also quite rng if you need a max run, but seems somewhat more stable at least compared to Lumi.
I've dropped the basic Maul trio as it was just annoying and as the R8 B2 team is so easy it allow me to max personal box with suboptimal Lumi and Beq runs, thus saving my own sanity.