You’re in soil or coco? I find you can get some pretty big plants in less coco. Now when I was growing in soil, I had to make sure I had plenty.
The one I had in 1gal coco gave me 6oz. It was huge. If I wouldn’t have run into problems with mold, I would have had 8oz easy. It was hard to even pick it up by the pot and carry it bc it was so top heavy lol