If it's the old style RBA with just the juice channels and you're using high VG juice, turn it down to 8.5 watts or so, close off the large air hole and use the middle one, draw slow. When you first installed it, did you soak the cotton well before closing it up, and if you did, did you get good flavor the first few hits? Been my experience, the old style RBA with the juice channels in the bottom don't wick high VG real well.