I just bought a mini Grave Digger for my son for Christmas. When I tested it out I noticed that it accelerates slowly and then goes full speed. It feels like the speed controller is limiting the current when starting from a stop. Is this normal? It doesn't wheelie from a stand still like the Grave Diggers that I've seen on youtube. I broke in the motor by just driving it around at half throttle for the first pack. I didn't think I would have a problem with the motor since my Slash motor is still going strong after a year and it wasn't broken in at all.