Lipos are not sub-c cells. I am not sure but have you seen how the go KABOOM in the lap tops and they are not crashing...WOW!!
Brushless sounds good to try but why should the series pay for them? The technology is not proven yet. They still shut down. Going slow never shuts them down its when you try to go fast that it happens. I have a 4.5 novak system and no matter how I gear it in the florida sun they still shut down.