Do you know the best weed for making vape oil from the buds ?
I don't think it really matters what kind of weed you use. Top notch bud or trim is all going to get you to the same endpoint. The only difference will be percent yield relative to input mass.
The more important thing for you is to unfuck your process so you get something usable for what you want to do that isn't going to be potentially toxic. Here is a good write up on QWET which you can do with very little equipment.
QWET Extraction With Ethanol
skunkpharmresearch.com
Doing the quick wash while keeping everything as cold as possible (weed, ethanol, glassware, strainers/filters all need to go in the freezer) will get you very little wax dissolved in the ethanol and the oil once you evaporate off the ethanol, it will be pretty mild in flavor and far purer than what naphtha could get you. When you evaporate it off (assuming you are just going to boil off the ethanol) do so with really good ventilation and a heat source without an open flame. Using a flexible silicon baking tray for this will make your life much easier in the long run. Once the ethanol is gone, maintain the oil at 115C for 25 min to fully decarb it. If you don't like how it tastes you can dissolve it in ethanol again and mix in some activated charcoal then run it through some coffee filters. It will strip color and flavor but you will loose
terpenes too so if you care about that, know that there are trade offs. Once you have it at a state you are happy with, thin it out with whatever (other than vitamin E acetate...) and load your carts.
You can salvage what you have by dissolving it in ethanol (190-200 proof), freezing it as cold as you can for a day, straining out and fat that comes out of solution and then boiling off the ethanol and doing the decarb.
-Sandow