So I'm planning on buying a Kanger subtank mini for my Istick 30watt and I'm not sure If I should buy the .5 ohm coils or the 1.2 ohm coils as replacements. I'm looking for decent size clouds with nice flavor and I also want to maximize my Istick and use up to 30watts for when I want a huge cloud but around 20-25w as more of a casual setting and since the 1.2ohm coil is only rated for use between 12w and 25w I'm not sure if I should get those or the .5 ohm coils as replacements.