Wow, I'm sorry, I've been MIA and had no idea there were messages here! 
I learned quite a bit at e-cigarette-forum.com (part of how I became MIA here, lol) ... there is a DIY forum there, with tons of info to sift through. The best tool I found was a small prog called Juice Me Up by Breakthru (free; it should be easily searchable). It calculates exactly how much of each ingredient you are using to get the perfect blend as well as the right nicotine level for you. I haven't been doing much mixing lately though, because I finally found a delicious clove liquid called simply Kretek from Tasty Vapor... it is at least 95% my all day vape, so not much need for mixing lately. I still plan on honing MY clove recipe one of these days, but TV's Kretek is similar enough to my very missed original Djarum Specials.
I learned quite a bit at e-cigarette-forum.com (part of how I became MIA here, lol) ... there is a DIY forum there, with tons of info to sift through. The best tool I found was a small prog called Juice Me Up by Breakthru (free; it should be easily searchable). It calculates exactly how much of each ingredient you are using to get the perfect blend as well as the right nicotine level for you. I haven't been doing much mixing lately though, because I finally found a delicious clove liquid called simply Kretek from Tasty Vapor... it is at least 95% my all day vape, so not much need for mixing lately. I still plan on honing MY clove recipe one of these days, but TV's Kretek is similar enough to my very missed original Djarum Specials.