Well my tek is very similar to this one (only I use small amounts of bark just in case anything goes wrong, so your safe) the typical type of Naphtha I use is ''Ronsonol lighter fluid'' (but i think the american VM&P naphtha, think thats what its called) and I would use liquid naphtha (aka lighter fluid) but I am shure others might use something different depending on the tek you use ??
If I remember my homework Naphtha will only pull ~1% dmt of your MHRB (as it does'nt pull all alkaloids) while other NPS solvents (like menthanol, xylene and toulene) will pull more alkaloids and you will get ~2% dmt
For more info on Pulling a greater yeild out of your STB look up ''Jungle Spice'' in the FAQ
FAQ (correct if I am wrong nexus memebers)

Like i said my tek is very similar only when it comes to freeze preciptation i use a
Glass Baking Dish and after freeze precip i then use razors to scrape out the dmt (making shure it is completely dry 1st and has no remains of naphtha left in dish) and then store it within a bag within a bag in a cool dry place
Also after you have added your naphtha (and given it a shake) and are waiting for the 2 layers to seperate I heard leaving it for a little while means more dmt will collect in your solvent rather than just waiting for it seperate and collection the solvent staright away
P.S I did start by only pulling around 0.7g of nn-dmt after I improved the technique I manage ot increase the yeild and can typically get around 1.2g of nn-dmt out of 100g of MHRB now
ooh and i did hear an A/B tek can pull a much greater yelid than STB (but i have yet to try an A/B so i dont know much more than STB)
Hope some of that info helped you in your quest