It could be that the atty is starved for liquid. This will lead to a harsh almost burned taste. Try dripping a few drops of
juice directly onto the bridge, then, making sure the cart is full, put on the cart. If the filler is pushed back into the cart too far it will not wick to the bridge and cause the harsh taste. The atty should hiss and sizzle while
vaping. If it is not, its either not getting
juice, or it is clogged and not allowing enough air through. If it requires hard pulling, it is clogged. Remove it and blow it out through the batt end into a paper towel. If this doesn't clear it, a how water ringe with blowing will hel;p clear out the gunk, then let it dry for a day before using...and remember to drip a few drops onto the bridge when you use it again. Good luck and let us know if this worked out for you!