>>521565
Anon, with how close you were, here's the piece of advice that'll bring you over 20k - replace Shockstar on Lighter with Astral.
Or, even better, because we're in this patch and all, replace Lucy's Swing with Astral and Lighter's Shockstar with Summit.
That's quite a lot of DMG you're giving up.
In mono-Fire, I'd run Moccus over Rocketboo.
You can also try out Brawlerboo if he's 5 stars - he builds up a bunch of Fire Anomaly at the very start of the fight, which is where it matters most, after the initial delay, Inferno Metal uptime is very high.
Given you're running S11 + Lighter, you should most certainly swap her #5 for PEN%
Your disc is alright, though, so try not to lose too many sub-stats.
One is fine, two is pushing it (I'd need to run the calcs to check it), three is most certainly not worth it.
One pretty big mistake you can make with Lighter is starting his Morale-empowered punches and not spending the entire bar (especially if you fail to trigger your W-Engine's Impact boost).
That can cause you to lose 10~20% of his DMG% increase, because it generally depends on the 20% Impact buff he gets when he empties out his Morale.
It's generally better to avoid doing his punches if you aren't planning on spending the entire bar (the exact threshold depends on what W-Engine and discs you're running) - you can refresh the full stack of his buff without recalculating the damage value by doing a Chain Attack.
Your burst combo in that team should be:
>S11's CA > cancel > S11's BA1234 > S11's CA > S11's BA1234 twice > Ultimate > EX if you have it
Ideally, you'd want to get BA1234 in before the stun as well.
You can even EX immediately after the stun but before triggering a CA, just delay a heavy attack from Lucy or Lighter (especially him, as his auto Quick Assist can be too fast) so you don't lose on damage.
Ideally you want to swap off S11 as she begins her BA4 and get a heavy attack in (to trigger CA) immediately as her BA4 finishes.
You can use Lucy's EX or Ultimate just before S11's own Ultimate (BA4 starts > swap in Lucy > EX > S11 QA cancel into Ultimate) to make sure you have at least one stack of Astral up. Ideally all three of course.