Did you run the Stock Pinion or the 25t on these 3s runs, also what C rating are the Zippys you used?
For a 2s guys I recommend
www.harrisrc.com
he has a 5000mah 2s 30C Hardcase Lipo with a side exit wire which fits the Flux sweet as.
$100 AUD each - Thats around $65 US!