Would you still use such a high number like 20% that was recommended on Vapor Shots? I tried 2 blueberry / vanilla flavors at the B&M. The 1st was blueberry / french vanilla, and I wasn't too crazy about it, the "french" was overpowering. The 2nd I had blueberry w/ vanilla ice-cream, and I told him to put a little extra blueberry flavoring since he said blueberry was kind of weak. I plan on trying multiple types of blueberry and vanilla from a few vendors tho, I originally wanted to get TFA's blueberry Extra. Just waiting on this 1st package tho so I can get some hands-on experience, cuz I'm still clueless about how varying % affects flavor, and how much % I really need. I got my work cut out for me lol.You should first mix each flavor seperately to see what percentage you like of each before you mix them together. It's easier to figure out that way. Just a thought..