Another tip: I remember finding that if I made the wick too dense, I got a fair amount of cotton taste. There is a common saying of 'less is more' that applies to cotton wicks. There is a 'sweet spot' of wick density that wicks the best, and it does not require much cotton, at all. Making it too dense adds more cotton, therefore more cotton taste, and degrades wicking performance, which can lead to overheating the cotton, thereby giving even more cotton taste.
So, try using just enough that, when loosely twisted, it very easily slides through the coil. For me, that amounts to a tiny pinch of cotton.