So i have been making cannabis tinctures recently and have very much enjoyed there effects and potency. I normally boil my decarboxylated greens in 151 at 170 degrees F for 20 min. I normally strain that and run a second time to waste nothing. I have found that the second "run" is normally half as potent. So my buddy gave me 70gs of herbs he already used to produce some butter. My thinking is that i can do a second "run" and still get some decent stuff.

After doing this, i was unsatisfied with the potency. My question is: Is there a way to refine this product further? Would leaving the alcohol to evaporate increase the thc/alc ratio? continue cooking (thc degrades with heat)? any ideas? I just dont want to waste any cannaboids if there are any left.