My go to candle wax is 415. I really really love it. I add my FO between 185-195 and stir for 3 min. As others have said, not all FO's will throw in soy. Personally, I only keep about 10% of the fo's I try. But the 10% I do keep throw wonderfully and keep my customers coming back for more. The name of the game with soy is testing..testing..testing... like I said, not all fo's are going to throw and the only way to know, is to test.