Ive noticed that the FUMA cartomiozers give that common sizzle when pulling but shuts off immediately when I stop drawing on the carto. If i use a Greensmoke carto which i have tons of and have filled the sizzle is louder and keeps sizzling for a longer period after im done drawing on it. Any ideas why? When i put a FUMA cato on the Greensmoke battery it doesnt seem to make a difference.