Whenever i put cotton threw a coil i always make sure it has some resistance but not to the point of it getting stuck when u slide it back and forth.. 
 
     As far as the flavor wick/piece of  cotton on the coil,i havent ben useing them anymore..ive ben folding the cotton back on itself  but not on the coil.. 
 
    Glad i could help,keep on rockin the vape!!