Could be wicking issues for sure. what's your ohms and watts vaped at. which rba do you have.. I have builds from 0.2-1.4 ohms and they all vape, wick and breathe exceptionally well. Coil wick density is critical with all fibers. When twisted tight, should pull through coil easily, then untwist fibers to fluff and straighten them for maximum flow potential. Then it's just a matter of correct placement of the wick tails, so as not to block off any juice channels or right amount going through juice ports, or whatever you system allows for.
It's just one of those things, play with it till it's just right, then it will become easily repeatable. Then when switching to a new wick fiber, get to go through the same process again. lol