I like to throw big, but as yet I'm still self-taught and what I am doing is throwing them in one go and using porcelain. This is difficult, I find. I tend to throw thin and a large porcelain piece doesn't like that, no matter how much I dry it with a metal scraper. Nevertheless I've gotten acceptable (not super) results.
However yesterday I was watching someone throw a large pot and I noticed that he took it off the wheel after he made a cylinder, used a sponge to dry it, and let it sit for maybe
10 minutes.
Furthermore the way he threw it was something I've seen before but as yet have no explanation of: he didn't make the sides smooth as I do, but he gave it a corrugated look. Hence his inability to use the metal scraper to drying.
He then did something odd: he covered it with plastic as if it were completed, and left it overnight.
I don't know what clay he was using, but it didn't look like porcelain.