I still use a cartridge, but you really do need to keep them
very moist. I go through 2-3 ml of liquid a day (I tend to chain vape the same way I used to chain smoke though, so you may get away with using less). I also drip an occasional couple of drops on my atomizer if I start getting any "off" taste while my carts still look moist.
Another thing you might want to do is check for filler fibers stuck in your atomizer. I have switched to the pyramid tea bag rolls as filler so I don't have that problem anymore (thankfully), but burning fibers taste horrible!
Also, you can take a look at your cart opening and see if it looks like it is melting at all. The majority of my carts don't have this problem, but a couple must have been made a lil small or warped, and the straight edge seems to sit a bit close to the atomizer bridge. For the ones that looked like they may have been taking too much heat from the bridge, I just shaved a thin amount of plastic from the inside of the straight edge of the cart opening. I probably could have just tossed them since they are so inexpensive, but I'm cheap
Worst case scenario, you could just have an atty that runs hotter or "burnier" (pretty sure that's not a real word, lol) than most. I have a couple of atomizers that work perfectly all the time, and a couple that are thirsty beasts and need to be dripped on a lot more to taste right. You can try a different atty to see if it helps.
Good luck, I hope you get it worked out
