dry hits

I'm vape in a 50 50 mix at 18 watts and I get dry hits my holes are lined up in the space provided I changed coils many times 2 left in my package of 5 is there something that can increase the wicking when I chain vape or do I have to buy a second device and switch every pull
When I shank up the power to 25 if I hull on it for more then a second or 2 it's a rotten dry hit so how do I get more juice to the coil
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