I may be biased since I helped with photos and explanations, but I think its a great tek

I dont know if the vinegar soak indeed increases yields, I havent heard of a side by side with simple STB vs having a vinegar soak before. Personally the last times I extracted I did an A/B with limo pull and FASI, so not quite BLAB but similar, also because I use a separatory funnel which would not really be good with STB, and I always get great yields too.
If you do FASI, I suggest letting the limonene sit for a while (few hours/day) before adding the FASI, so that any remaining droplets of water goes to the bottom and you can remove it before adding FASI, otherwise you get a goo on the bottom appart from your crystals.
As for your title question, forget naphtha, there is no need for it. If you do FASI and then convert to freebase with water crystallization, you can get a product as pure as a naphtha pull (nice white crystals) without resorting to petrochemicals, it smells milder/earthier (a proof that some of the sharp smell from DMT comes from petrochem traces and not from DMT itself), and is much easier on the throat IMO
If you have any more questions feel free to ask