All nug runs? I gave up on BHO. I'm putting my resources into building my rosin press and cranking up a grow. It's been awhile but I don't think I've forgotten everything. Another thing I would try though if your still into blasting is to use a tube that your material Will fit tightly into. I ground all of mine out and on the first run iPad to lightly and all of it blue forward towards the screen causing impurities and that green color to get in too. My last run, by about the time it was too late I finally figured it out I packed coffee filter to make up for the space between the open hole and the patch material, and also use coffee filter on the tapered and to force the butane to slow down and trickle my last run, by about the time it was too late I finally figured it out I packed coffee filter to make up for the space between the open hole and the path material, and also use coffee filter on the tapered and to force the butane to slow down and trickle. I would use steel wool next time if I ever did it again for the tapered and that you spray into I figured out sort of by trial and error that using 150 µm screen wasn't enough two 50 micron screens wasn't enough and by adding more coffee filters you're just making it more pure add by keeping everything tight you're forcing the butane to trickle passed all of the surface area in your extraction tube. You may need to do more runs and use more cans or that may allow you to get down to the one can per ounce of standard that I read about.
Best of luck and be safe. Are lots of great YouTube videos but I'm sure you watch them all