I’m no “master” of these “arts”. Instead, I am a satisfied “devotee” of NET-master @Kinnikinnick.
If you go to most/all of this forum’s NET-related threads, you will find his many informative posts.
Post an inquiry of some sort to a relevant thread/post, and he may likely be of some assistance.
Google: site:forum.e-liquid-recipes.com "NET"
Note: I experimented (with RDAs as RTAs) with a number of various NETs for a good while before finding something that can suit my tastes on a 24/7 basis. It was (for me) a “very tweaky” process - where many variable come into play in delicate balances. As well, some of the things that @Kinnik enjoys (such as Burleys and Latakia process-cured Tobaccos) are way too much for my palate to be able to handle. So, it’s very subjective stuff (as can also be said relative to “synthetic” flavorings).