I don't know what others are doing, but I rebuild my PT3 coils. I tend to keep it fairly close to stock using 34 gage kanthal micro coils around 2mm silica wick and stacking the coils with 1mm silica wick between them. I build it to be 2 Ohm, and it works better than stock and doesn't leak a bit. I can run this setup at 6 volts without any burning or wicking problems.