its always a trial and error process, my genesis style tanks get the occasional short, but my A7 never shorted out on me.
i use a mini torch.
torch the whole sheet.
roll it up.
torch and quench a few times. i dont always quench in water, doesnt make that much of a difference.
dip in ejuice, torch , and repeat a few times.
then wrap the coil.
i get the occasional short , but once wick is seasoned enough, i can just wrap a new coil on the same wick and not have a short...
i've been doing this for a while and on occasion get a short with a fresh wick, so if you dont get it right the first time, dont let it get to you. just keep at it.
the trick is to not over tighten the wire around the mesh. you want it to touch, but you dont want it too tight that it will rub off that layer of oxidation, or whatever it actually is.