Hi and welcome,
I am vaping with the same device and I had the same "problem" at the beginning, when you change the coil and fill up the tank, leave it to rest for 5/10 minutes the time to remove the air and let the liquid going all over the cotton, higher the wattage avoids it as well.
I started with 1.2 ohm and 18mg liquid at 15watts and after a couple of months, the best set up (for me) is 0.5ohm coil with 6mg liquid vaping at 35/40watts (not to hot, good hit and good flavour)
I mostly use 80-100% vg product