I would definitely say a vv/vw device and a slightly different tank setup. My buddy had the basic evod kit running 28mg 50/50 mix and wasn't getting enough for him. He went back to our local shop and bought a 1200 mAh Ego VV2 and an iClear 30b dual coil clearo, and is running that at 4.5v and he is very satisfied now. VV/VW will make a big difference as will a good tank. I have a sigelei 20w and a Kayfun clone with a .8 ohm coil that I am running a 14mg 50/50 blend in it at 14.5-15.5 watts and the throat hit off of that is just as much if not more as when I had my ego twist with a mini pro tank 3 with a 1.8 ohm coil in it running 18mg 50/50. So the coil resistance and wattage make a big difference.