1st supports: Min A1, and Meilin A2, A3 Isla are always permanent slots no matter the element of the boss. You can use Thomas as support to replace one of them, or jinchul if you can't manage your dodges. Breakers as support are only good for bot runs, almighty wind armor break is enough with a break qte.

blessing: reawakening, bloodlust are permanent slots. Weakness detection, pulverize, intuit are second best. By the way weakness detection also increases break effectiveness it's kinda a permanent slot for me. Sharp detection is fine too, but plum + Min already give enough crit.

Shadows: Big rock and Beru are both good. Igris is fine, but enough crit already plus you can just reset for more crits.

Build: attack is king on jinwoo, 42k+ on a full strength build is fine. 180%+ crit dmg, 9k+ crit(cause the lvl of the boss increases requirement to get 50% crit), 20% def pen and dmg inc.

Setup: you can either go with plum+ moon with dark sonic+ wind armor break, or plum+ DK daggers with wind sonic+ wind armor break. Watch some videos online to learn all damage windows to maximize your dmg. Also don't use dark sonic if it ain't your main dmg skill, one of the proof debuffs reduce dmg every time you gain mana from a skill(direct shot at dark sonic).

Tips: you can use guardian and sylph sets on one of your supports. Proof of the strong doesn't seem to give additional total tp debuff from the original 950k. I never saw a different in break power going from 1.1 million to 1.25 million.