Finally...
I finally finished Focused Flashback. I think I lost my soul. That stupid 4 turn damage reduction is awful. You can sorta bypass it with AnAn on stage 2, but you have to look into the stage mechanics a bit because you have to stun one of the mini mobs with her attack card every turn if you want to get a 6 turn clear (which one you stun depends on the round). Stage 1 will kill you should you exceed 8 or 9 rounds or have the audacity to bring a non-premium sustain (ask me how I know). Stage 3 was fine, for me, but I also have P2 Beryl and Isolde (I kept losing to Isolde on those free random 6* things before her euphoria released), so it's not really the same.
Anyway, the general theme is, have portraits, or have resonance. P0R10 is dead here. Also, A5 your psychubes (especially if you want to Bloodtithe Stage 1- your damage rolls can be the difference between 6 turn and 9 turn clears).
Good luck! (And also, get rid of the damage reduction, Bluepoch. Half the issues people have doing a 6 round clear come from that stupid thing.)