I suggest you use 28 awg because it is thicker and more durable than 30/32 and will make your life a lot easier and obviously gives lower resistance.
Longer coil basically increase the resistance, i suggest you try 8 loops on 2mm screw driver and see how you like the vapor then reduce to 6 or 5 if you feel vapor production is lacking.
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Hey thanks for the tips, yeah okay that makes sense. I shall get the 28awg then, i have these ribbon wires that come up to 1.2 ohms with 4 coils are these ideal? or even better than the 28awg normal ones? thanks again