Oh darn, forgot about that part! I did indeed level up (130, so 375 max stamina now) last night after running ?-8 for the first time.
Still, I'm not worried too much. With 480 stamina/day (not counting gatherings) and 138 dumplings per 160 stamina if these SGs keep coming like they do, that's 414 dumplings/day. So 5 days for 2,070 dumplings.
As for FG to refil stamina: see next monday how far you got, and then decide whether it's worth it to you or not.