"I've found that the 2.2ohm heads work best for me using 70/30 juice. The 1.8 on a 3.7v ego battery was giving dry hits and needs about 3.5v I reckon. I tried cutting a bit off the silicone cap but got flooding. Also tried cutting the longer wicks in half which may be helping to wick the juice in better and raising the cap a touch before screwing on the mouthpiece. Been getting gurgling too and have tried tightening the battery connector underneath a little with a screwdriver - working so far. IDK, still fiddling but happy I switched from regular cartos."