I've read here on the forum that it's ok to mix MTS oils to save on pinning. I assume that, even though they ship from different locations, it's ok to mix stealth and standard oils? Can someone confirm this? Next question...say I want to mix oils A,B and C together in a ratio of 1:1:1 for example. Is it best to try to get 1ml out of each vial into the pin or to mix up a big batch by transferring 10ml each of A,B and C to an empty 30ml sterile vial. And I'm guessing that shaking it is a bad idea, maybe spinning it gently so not to get air bubbles into it. The concern is would this big batch be uniform? If anyone has a good procedure for mixing up a custom test blend I'd appreciate it you could share it.