Indeed, follow it to a T. Don't deviate from a tek unless you have a solid grasp on the process and what you are doing.

Also, are you saying that you put the whole mix (basic lye sludge and naphtha) on the stove to heat it? That is extremely dangerous! Naphtha is very flammable and should never be anywhere near a direct heat source like a stove.  Use a warm water bath by heating water in a container large enough to hold your extraction vessel and then put your extraction vessel in the warm water, far away from the stove!

Hot naphtha pulls more impurities (plant fats and oils) and can hinder the crystallizing process but as Null24, just because it is wax does not mean that it won't be potent.