I do about the same. I fill mine just to where the clear window meets the stainless. I've yet to have a dry hit, which, from what I hear, is pretty awful with cotton.
I think I was over filling it also.. I would put 3.5ml in and it would almost come to the top of the clear window, then I would add more. I didn't think that it was my wicks but the equalization of the air pressure. I think (please please please) I have finally got this thing figured out LOL

and yea.. a dry hit with cotton is pretty bad!

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