could be just from a dry cart, is it same taste with dripping when it needs a few new drops?
I didn't like the cart filler so of course the first thing I did was to mod the filler. then went to dripping, then to the C2s Aaaah now we have it, then a tank mod so it would last all day. Also when I was dripping I would use about 10 ml / day. but with a tank mod, I only vape about 3ml/day. so I think most was due to flooding the atty.
Yes there are some issues with C2s I'm sure you have read the c2 threads. but when they are right, there grrrrrrrrrAte.