I tried upping the watts to the maximum what my coil allows (16w). It didn't help. Also, i don't think this matters, but the vape has been sitting unused for like maybe 3 months. I thought it wouldn't matter because i changed the coil and washed the tank with water. It must be a bad coil i guess.I have found Zenith coils to not be real flavorful, you could try upping the watts a little at a time. Or it could be just a bad coil.