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[hemiblas]

You should really just post some links on what you are considering. You can get 30C 2S packs just like you get them in 3S packs, just depending on how you want them built. I dont think they offer the 30C is 2S for the flightmax lipos. Just the C rating is not going to help. 2200 30C lipos wont work, but some 8000mah 20C lipos will. Are you looking at the 5000mah lipos at 20 and 30C?
You really want to look at the continuous current rating of the battery. I think someone posted 120A or over is a good number and I think I agree. So some 25C 5000mah packs should do nicely.