33k is actually better (~330 coins/stamina) than any of the "workaround" I posted, save for the low exp. On average, I get 25k from Mori Mori without the gold up (higher if my squads weren't avoiding the middle loops), which is roughly what I get from Zaku Zaku 80 with gold up.
I have been actually dedicating Saturdays to just running Mori Mori since reading this guide (from the mod who's been answering some of my questions over at the wikia, as he's also an editor/translator there)
Given that coins have more uses in here than in Nutaku (e.g. blooming, equipment upgrade, garden purchase, coin shop, promotion abilities, etc...), I figured I could never have too many coins.
Coincidentally, I also have 15 Lv.100 purple manyus for my evolved Queen, currently at Lv.48. I don't know if they'll be enough to power her to 70 yet, but as I'm planning to swap the last event girl on my team for her, I'll try to make that happen.
I do have a set of Lv.5 purple to power her again post-blooming and will use my other affection heart (first one went to Justicia) to work on her next affection meter, as the stat gain on bloomed forms, they say, is rather subpar compared to that of pre-bloom.