I haven't rebuilt them with dual
coils, but I do put a single coil (4 wraps 32 gauge kanthal, cotton wick, comes out around 2.0 ohms) in the PT3/AeroTank coil housing. By itself, it leaked and gurgled like crazy because the side holes are too big. Fixed this problem with a piece of cotton on top of the coil. This flavor wick prevents the liquid from leaking into the center tube.
Been hitting these hard for a few days now. No leaking or gurgling whatsoever. Good vapor production, and great flavor using cotton.
Love my AeroTanks even more now, that I know how to rebuild the coils! Gonna try 30 gauge next, in order to get more wraps while staying around 2 ohms, as well as experiment with some vertical configurations.