Buy an ohms reader or digital multi meter first! If you haven't, learn ohms law. Learn how to spot a short. With no ohms reader you could be drawing too many amps from the battery and it could blow up! Do you know your battery continuous discharge rate?
Please respond to the above!!!
After ALL of the above: at 28g, maybe 1.5ohm should be ok.
I always use single coil, around 1.5-2ohms. With a single coil, you may want to try putting some tape over the opposite 3 air holes, blocking them. And only using the 3 air holes in front of the coil.
Lifting the coil up to the same level or above of the air holes will help.
There are far more important things to do before you ask about clouds.
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