cotton balls

k , so as the title says , im rebuilding on my goblin mini and many times i get the following problem : i build a single coil(dual core clapton ,been using that type of coils for months ) install it , wick it and when i vape it , i get a dry cotton taste , muted flavour and significant less...

I have recently but myself a vape mod (tug boat) and every time I need to recoil I need to ask my friend do it. this time I want to do it myself, what kind should I use and are these Cotton balls OK to use?