So i just got a stingray X mech mod with a infinite lava rda (.5 ohms with 3 mg nicotine 100% vg) if I put this on my stingray I cough almost every time when I exhale, but if i throw the same rda (with the same build and juice) on my EVIC its smooth and i don't cough even at 30 watts, I even tried it on my friends istick at 40 watts and it was fine. Can anyone give me any tips or suggestions I was thinking it was an airflow issue until I put it on my EVIC. Also the battery in the Stingray is a sony VTC4 18650 2100 mah batteries (also the same that I put in my EVIC)