I guess the old motto is true...if it ain't broke, don't fix it. What were you trying to accomplish by adding the additives? A harder wax, a higher pour temp, etc? Also, I think you're adding the FO too early. Not that it will affect the set-up, its just that at 180 degrees, you could "burn-off" more of the scent than necessary. I personally add the FO in soy at about 120 or so, just to minimize the possibility of scent loss.