I haven't had much luck with anything wicking. Maybe I'm expecting to much. I just top off very frequently.
hey, check this out... since i discovered this method, i fill a cart w/ 10-12 drops, vape for hours and refil the same cart w/ 10-12 drops..
You need to follow the instructions exactly though.
http://www.e-cigarette-forum.com/forum/cartridge-mods/32683-only-way-ptb-works.html