Not sure if I'm following your decarbing to make rosin for edibles or to vape? You said vape juice why would you decarb when you vape that is itself decar ing I thought heat is heat. When they make live rosin it's from buds right off the plant. When you decarb THC chemically changes to delta 9 the THC that gets you high so if you decarb once then press it with heat it has already changed so you cant add more heat more heat then your oven like lighter heat just my thought.