Please do not limit erpm here. You will loose brakes when outside of that erpm window. Leave those set at your hardware default.
Do it instead by limiting duty cycle. Lower “Maximum Duty Cycle” from the default 95% to whatever you want it to be — and then make “Duty Cycle Current Limit Start” 5% lower than whatever you set “Maximum Duty Cycle” to. This will limit your top speed without turning off your brakes.