What method do you use to clean your atomizer?
My 5v battery mod does a good job of burning my 901 atomizers clean. I haven't been getting any carbon/gunk build up. My atty has been burning strong for almost 2 months now. My 801's tend to clog. Usually stuffing them will paper towels and draining them over night does the trick.
I use the "rythm" method..hasn't failed me yet8-o