IMO, if you got runoff with a quarter of a gallon using 3 gal pots, you're watering too much.
Did somebody here say they gave their 3gal pot a gal of water per feeding?
Yes I did say that. Once a day or every other day. If I skip a day I may need 1 1/4 gallon to achieve runoff.
After some searching, a 5 gallon nursery pot actually holds 3.9 gallons. I leave two inches unfilled to make watering easier so I'd say I use 3.5 gallons of coco.
3 quarts of water will not achieve runoff in my situation.