Ive been through several ecig models, and recently picked up a notcigs infinity and like it a lot. However, I bought 5 of the ikenvape 510 drip tip cartomizers based on all the good things ive read about them. However, 2 weeks later, running at 4.5volts and using BWB juices, they have all either stopped working completely, or degraded to the point theyre basically unuseable. Ive never used a 510 carto before, but ive gotten way more life out of kr8 cartos. Is there a different type of 510 carto that might last longer?