I think the coil might be very close to the airflow slot. This could also be the source of the extreme heat.
@tibor_balogh is right. Bring the coil wraps closer together to 2.5mm. 
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I think the coil might be very close to the airflow slot. This could also be the source of the extreme heat.
@tibor_balogh is right. Bring the coil wraps closer together to 2.5mm.