ok i got a kr808d-1 manual from V4L and an automatic from V2 cigs, my problem is the prefilled ive got from both V4l and V2 are awesome no problems, but i recently got blank cartos from v4l along with WOW cowboy menthol and WOW Peppermint e-juices. at first when i filled them (watching several how-to videos on this forum so not to screw it up) i notice it works pretty good at first but maybe an hour or less of use the cartos get really hot and very little vapor compared to prefilled or when i first filled them? im starting to rethink getting e-juices altogether and get prefilled, but i want to save money someone help me!