You should be fine with 30 Gauge on the Subtank rba section! I would do 9-10 wraps around a 3mm screwdriver to get around .2ohms but even if you want to shoot a little lower say .15-.17 you will have no problem on the M class. I've had great results with 7 wraps with 30 gauge in my subtank on both my VS dna 40 and my SX Mini M Class. I will say though that 28 gauge is so much easier to work with and the Temco 28 gauge NI200 is the only thing I've been building with now! I run at .11 and it's working great on my SX Mini.
Edit: Also don't rule out twisted 30 gauge for some extra stability!
Thanks for the info! I have some 32AWG kanthal that I was going to try twisting with it. Seems some folks have had good luck with that combo
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