well, eirin/reisen is relativly quick to get, there's a teleport near the start of f11 behind a red gate, and if you have the blue switch off, you can just take the tele and get eirin/reisen as the first thing you do on f11, besides there's a stone of awakening to the east of where eirin is so you might as well pick up both of them. ( nitori tends to have a problem with the ancient iron shelled tortoises on f13-14 thanks to their high defense.)
You get a manga meat in a chest, and a manga meat for fighting 50 battles or you can just buy them for 240 each from the shop.
Rumia can act as second tank and healer for hina if you get another love machine for her as well as help on the blue orchid fight.
Rumia gambler on the final boss would deal around 80k per moon if memory serves right, nice considering it'll only cost 6 mp and doesn't care about the boss buffs, might also help deal with the help he gets on the last phase if you need it. (Rumia is kinda awesome if you haven't noticed by now.)
(should be easy to inflict terror on hina considering you're using parsee to tank and picking up kaguya on floor 5 means you can bullet branch her for good damage.)
assuming a lvl 49 rumia set up and equipped so that she has 3k mag for the below strategy.
12f tenshi will get about 1, maybe two attacks off before the damage from rumia starts to force her scripts, and if done right, you should kill her on her second focus. if tenshi decides to use shadow step or grass knot as one of the two attacks she gets at the start, then healer eirin can over heal rumia so that rumia doesn't have to be withdrawn to dodge the first focus-attack.
Forbidden tablet gives spirit resistance, the same element the focus attack deals, but rumia's max hp is low enough that it's still oneshot her dispite taking half damage, hence eirin, also 12f tenshi doesn't trigger her anti buff attack during her scripts I think and if she does, if you keep the mag and attack buff from art of the battlemage under 50% tenshi still won't trigger her anti buff attack.
Near the end, you can withdraw your second slot for rinnosuke to try to get the star drop.
(this is what trying to grind a free orb of earthin and cinderforge sword teaches you, how to kill tenshi quickly.)
Another thing I remember is the at 50% Hp iku is scripted to not only buff herself but to do her AOE, even if she drops below 33% HP between the buff and the attack, that caught me offguard once.
Also noticed your notes say fight mokou but not picking her up, might wanna for the Resurrection and the blazing passive for the f14 touhou boss and the f15 sigil boss, both of whom start the battles with strong attacks and are weak to fire, and any melee attacker can have explosive flame sword to use with the blazing passive.
