I've got to agreewith AmiSMB with this, 3.2A * 20C is only 64A continuous, which is not going to be enough. Running packs under 5000mAh is fine, but the C rating must make up for it, so you would need 30C packs at least for 3200mAh to be fine. Even then they will be quite pushed 3.2 * 30 = 96A which is about right but they will get quite warm and won't last as long (i.e. as many cycles) as a larger capacity pack that isn't as stretched.
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