Are you guys drying the
tobacco before starting? I do some MYO and know that if you leave
tobacco out to dry you could probably get it to an almost dust-like state before starting the process. Would a good drying help in getting more extract out of the leaf or are the desired alkaloids in the oil/moisture content of the leaf?
It might help with the math a little.
For example, 20g grams of fresh cigarette
tobacco is only about 16.5g of actual tobacco (dry weight). Pipe tobacco less still.
NAS should be ~17.5g.
But in a process such as the one described in this thread, its probably for the best to round up anyways. Plus with so much of the math in the dark, you'll end up relying on your self-regulation of nicotine (& related) more than available numbers to estimate yield.
Although... When I would make my own stuff, I would add enough water to liquefy the tobacco dust. I would then add the alkali, stir,and (slowly) evaporate the water until dry. Took a few hours, and wasn't really necessary, but the results seemed an improvement.