First, turn down the wattage and see if that helps. You may have to re-wick with a bit more cotton to cut down the juice flow. As with all rda's, a little popping and spit back is to be expected but as the coils develop a little gunk on them, it should calm down a little. You could also try a higher VG juice and that may help some, but there will always be a little of the issues you're having right now. Learning to add just the right amount of cotton for a wick was the hardest part of learning to build my own coils. Good luck and remember that your efforts will pay off.