>>535653710
The best way is Rin with 1 dupe and this fatty tank, the shielding slot 5. Slot 5 should ST buff Yusuke and then do the big AOE for some extra damage.

Rin with 1 dupe starts with her special thingy so you can immediately use skill 3. Skill 3's issue is that you don't get the buff for many hits, but in this team that works out perfect. Wonder shields with wind persona, fatty shields Yusuke, Yusuke prepares parry. He will hit all enemies for near double damage.
On the off turns, Rin uses the def down.

Like I can't be arsed to do the highest difficulty myself, nor do I care about how to maximize damage, and even like that Yusuke with his 4* weapon gets more than enough points.
Make sure you have his basic set that gives 50% crit damage on his counters + ice damage.