What batteries do you guys prefer in your 17.5? I'm running nanotech 4200 shorty packs and they're great for the first couple minutes but they seem like they lose a lot of punch pretty quickly. I run nanotechs in my scte as well but I don't notice the loss in punch as much because the truck has so much power. However with 17.5, I obviously need every drop of power I can get especially at my track. I understand all lipos will lose some punch while using them but like I said, mine seem to be losing quite a bit of punch. Do you think it's just because they're nanotechs or does this sound normal? Btw, they're only about a month old and they're very well balanced. No puffing or anything.