My new UFS is working great except for 1 small problem. Sometimes I get a dry hit. A couple of quick pulls without firing cures the problem. Is this something that's common? I'm vaping 50vg/50pg. And my feed is adjusted almost completely open....My airflow is just cracked and I find this is the best combo for the most vapor. But why the dry hits. I'm using a COV 1.5 DC Atty.