I'm at 30/50 on round 6 now, and as I don't think they're going to add more resets to the gacha for Phase 2, I'm pretty sure I'll manage to clear this event even on a worst-case scenario. Though I don't have any issue with using a flowergem incase I end up short off the finishline.
480 stamina / day = 6 times ?-4 a day, which is 3,000 ancient coins a day. So that's at least one 10-pull a day until november 29.

Last night I got all the manyus and both 10k gold coins from the gacha in a single pull, so the moment I pull that Dressbloom, I'm gonna reset, it's the last important thing (and the only requirement) left before a boxreset.