Also the product you get by using xylene is a different product you get with aliphatic naphta. It pulls the so-called jungle spice, which contains along with DMT some red colouring, beta-carbolines, mysterious jungle alkaloids and whatnot. You can't freeze precipitate xylene, and it takes a very long time to evaporate. And it stinks.
Check out the cas numbers on your solvent. Then google the cas numbers and you will see what is in the solvent. Anything that has only light aliphatic naphta (it usually says something to the effect of "Naphta, hydrotreated light" or "Petroleum distillate, hydrotreated light" or "Solvent naphta, light aliphatic" on the cas listings) is good for freeze precipitation, and also pulls quite selectively so you get a pure product.