So I feel like I should be yielding a lot more BHO than I am although I could be wrong. I need some advice on how to maximize my yield. Ive read conflicting opinions on almost everything I can find about BHO. Is it better to use ground up plant material or keep it together? Should I pack the extraction tube lightly or more tight? How many canisters of butane should i put through a 40 gram glass extraction tube? Is vector really the best butane to buy for the price? Any answers are much appreciated. Ive been getting 3-5 grams after running 4 canisters of butane through two separate 40g extraction tubes. 2 canisters per extraction tube.