I have a kanger cupti with .5 coils and usually vape around 30 watts. My problem is that when i fill my tank the first few hits are great and very tasty and flavorful. Then there is no flavor for the rest of the tank. I switch flavors and the same thing happens first few hits are great then nothing. I have tried new coils, cleaning everything, and even putting a few flavors in at the same time. Anyone have any ideas? Thanks for the help.