Place coils close to the airflow and not close to posts, use good wicking, and if you make your ID shorter(2 or 2.5mm) then that equals more vapor produced in a shorter amount of time(better ramp-up), due to less saturated wick-volume cooling down coil, although for hot builds, sometimes upping the ID is needed(3 - 3.5mm, but I would say it's a too low build then, if needing that), especially if wanting to take longer draws than one sec... If you don't mind taking "long"(for me
) draws(2 sec+), then you can build pretty high with nice vapor production still... There's no "one-answer-for-all" to "what build for clouds", but as stated, steam-engine is a great tool/guide to use for when you have determined what heat-flux you prefer to vape at, then compare different gauges of wire and builds(single-wire vs parallel) for maximum amount of surface-area under wanted resistance and least amount of heat-capacity preferably...
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