I’m at a loss.

Hi, wondering if anyone could help. I’m running a geekvape Z sub ohm tank with either the 0.2 or 0.4 coils with high VG 70/30 juice, the wattage I use is in the parameters stated on the coils but for the life of me I can’t get a coil to last longer than a day and a half?? I’m at a loss