You know what, I think 5s setup would work for you better, just taking into account the voltage drop you will see, the voltage should be roughly 12 volts at a 80-90 amp burst. With my MAXX truck, I consistently get 135 amp bursts.
I never got a chance to do an Eagletree test with 5s1p compared to 5s2p. But I did run it, and I can say the punch was a lot less, particularly at speed, but I would be drawing 130 amps peaks, that's heavy duty for 2300mAh!
Maybe just make temporary 4s pack, see how it performs, if it needs a little more, then add the extra cell? :032:
HERE is a Eagletree of my truck with 5s2p A123, Quark/7XL, geared 18/51, and hard bashing.