Hi, I am using a kanger protank 2 on an eleaf 30w mod. I am using a kanger 2.5 ohm single coil. I am vaping at 6 watts/ 3.9v. The juice I'm using is 50%vg / 50%pg. I refill the 2.5 ml tank about 3 times a day. The coil only seems to last 1 day and then there is no flavor or it tastes burnt. Shouldn't these coils last longer than 1 day?