My gal and I like to have around 4ml capacity and around 1.5 ohm coil builds. Vaping high VG unflavored ejuice so not concerned about flavor. We've been vaping for about 3 years using mainly GS Air 1.5 ohm and most recently Melo 3 with Triton 1.8 ohm coils. I'm tired of buying factory made coils and we don't care for the sub-ohm coils we've used. Around 22mm and 25mm suggestions appreciated!