Im not sure what youre asking but on average from first pass disty i may loose 7-12% weight but the potency goes way up. Magsil doesnt hold back thc… and 80% crude is often high in thca… so after decarb, that percentage can go down as much as 12%
@anon42519203 his tech is not expensive in yield losses by weight
If the right precautions are taken
Prewet and flush your powders with solvent
And use a Heatgun to get last bits out of containers or flasks