Do you have another radio to try? It may not be your problem but I only ran the stock radio for one pack. I can't remember the specifics but it was something like glitchy. I didn't really upgrade though, I just like the feel of a cheap Kyosho mini inferno stock radio. Worked fine with the redcat reciever too. Perhaps something inside the radio isn't soldered fully and it reversed the throttle channel for you, regardless of the switch.