I’d say 40+oz in a 4x8 is approaching risk of bud rot...I pulled 20oz from a 4 x 4 last harvest and it was so dense I had bud rot pop up out of nowhere at the six week mark hears what 20oz looks like in a 4x4 ....4 plants 4 way lst running 500 true watts led....1XL mars hydro tsl 2000...and 2x optic 1 xl’s....that’s with a giant dehumidifier running 24/7 and 2x 8” fans exchanging air in tent with an isolating fan running and a carpet dryer fan running 24/7 as well .....can u pull more.....yes would I?.....no not worth the risk....once u get near the 20oz mark in a 4x4 it’s so dense with humidity no amount of air exchange will stave off but rot unless you can keep humidity below 50% 100% of the flower cycle....I live in a very humid environment so if I lived in a dryer area I’d shoot for 2lbs