Well, I'll just have to tighten up the steering and set the radio for exponential steering to maintain fine control. How heavy is it right now with the 1512 and 5s?
You can use the 2200mAh packs from KongPower. I have used them as high as 120A bursts. I have 2 2200mAh packs that had a max burst of 128A and they are lighter then the higher capacity packs.