The absolute easiest way to take full control of your Rise's motor is STunlocker with a premium license, Shimano SM-PCE02 usb adaptor with EW-SD50 cable for connecting at the EN-100W junction box (led light indicator box) + a windows laptop or computer.
With this set up, you can fully customize not only wheel circumference and top speed but also alter the torque and power output to your liking. EP8rs is really a regular EP8 and is 85nm/500W capable, you can tune your motor up to these specs (or anywhere in between) and have a mid, or full or mid-full power light weight ebike, however you it suits you best.
Been using my Rise with modified torque and power settings for months now and it's brilliant.