Have you ever dripped before? If this is your 1st go I would say it's:
a. Too much nic, when i went from my 3 year old Inferno to my Natural with a RSST RBA I went from 18mg to 12mg. I couldn't vape 18mg with it. I'm getting some 6mg to use on my Igo-W, 12 isn't too bad but I want to try 6mg.
b. Air hole misaligned or not the proper size. I'm not sure about the Igo-L but my Igo-W had 2 holes that required a dark room and a bright light to find. I drilled them out 3/32" and it's a much better drip experience.
Those are couple things I would look at.