Hello i have been vaping for about 8 months using a evod tank and vision spinner without much problem. But since i got the sub tank i been coughing and wheezing a bit. i changed my nic. to .6 i read you was suppose to do that so i did. i am at about 15-20w, I also prime my coils very good and let it sit for a bit. my juices are between 50/50 and 70 vg/30pg. do you think this is b/c i am not used to the new tank yet. it been about a week and still happening. Thanks for your info 