So I recently got into processing BHO in my spare time and I’ve done about 5 runs. The problem I keep running into is getting all of the butane out of my oil. My set up is a mason jar with a vacume seal lid and a mityvac hand pump. The problem is after I finished vacing, the oil still has bubbles (not sure if it’s butane or turpines) and when I spark my lighter under the oil it sparkles:(. My mityvac only pulls about -25, could that be the problem?