Just a little heads up, FlavourArt and LorAnn super concentrate only need a drop or two per ml for the flavor to come
through. As far as TFA it seems pretty well diluted so I usually use 10%-20% with those but makes the flavoring go fast. My best advice is to make small batches without any nicotine in it (5ml is what I do) until you get a flavor you like. Premixing your PG/VG/Nic saves a ton of time but wait until you know the ratios you like. I've been doing 50/50 PG/VG but leaning towards 70/30 PG/VG due to PG carrying flavor a bit better and wicking better. It's really personal preference though. Also a debridged 306 or 510 atty for taste testing is a good investment. I've been at it about 2 months now and finally getting into the groove of it
Although I do have a "suicide mix" bottle of failed experiments, not wanting to waste the nic since it gets costly, which is why I've started mixing 0mg for flavor testing. The suicide mix is actually kinda decent now though lol has like 15 different things in it.