besides the vertical build I had in the mini (which I took out to try another build) all have been coils that were at the same lenght as the airflow base, this seemed fine, but gave no lenght of shoulders to the wick. My latest coil is a bit shorter and this is giving me some wick shoulders , which seems to be a better vape. Who knows, it may not be that at all, but maybe that little extra bit of wick at the top is like a reservoir for holding a bit more juice.
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