Is it VG or PG that might make a juice taste greasy? I am using several things...Stardust - medium flavor I think, tank with carto and T3 bottom coil.....some juices I have seem to have a greasy taste, or maybe too buttery , not quite sure how to explain it....so wondered if I buy a different % it might be cleaner. Using 80/20 PG/VG right now.