I've been using geekvape Super Mesh X1 - KA1 Replacement coils .2ohm for about 2.5 years. I use them in an Aero tank on a Aegis mod. I keep my wattage around 34. My batteries are Samsung 1800mah. When I change my coils I turn the wattage down to 30 & work my way up over about 2 hours. I haven't changed my liquid at all. But, the coils have not been lasting. I used to get at least a week out of a coil. Now, the first day it becomes increasingly difficult to draw. Then, the coil starts to taste burnt by day 2. Does anyone have any idea what I'm doing wrong?