Serious question: Who told you to pre-fill all screw dimples before taping?
My foreman Mike swore I'd save time doing it all at once after hanging, but I tried his method on a 40-board ceiling last Tuesday and ended up wiping mud off three times because it was drying too fast.
His method sounds like a nightmare. I tried pre-filling everything once and spent more time scraping dried mud off the ceiling than actually taping. Never again.