the more vg the faster they clog, the darker the liquid the faster they clog. also if you vape in very short bursts you're probably caking on
juice faster than you should. you can't get away from caking on juice eventually though.
too love of voltage on the atomizer probably would cause the same accelerated caking too i would think.
i remember i had some pecan roll juice, black as dirty oil, tasted delicous, but could only vape it for 4 hits in an egoT tank or cartomizer, ended up trading it away to someone who could use it in an atomizer, which i think have less issues with that and get cleaned more often anyway.