Reprogramming the controller won’t really get you any additional speed that the Magic Magnet couldn’t. It can change your motor performance profile a bit, like acceleration lag, etc.
Your best bet for additional speed without buying a new motor is to add a 7th battery to bring the GEM up to 84 volts. With the stock motor, you should be able to hit low 30’s. I have hit 39-40 with the 7.5hp R4F motor on stock R12 tires and two of us in the vehicle (I have since set the governor at 35 though because that’s 6k rpm on the motor)
We both achieve the same end, more speed and more range. We’re just wired up differently. Rodney’s costs a lot less, mine has a lot more convenience to it. If you are thinking about it, I can go into more detail.