To put this into perspective the difference in time over 100m between 60Km/h and 55Km/h is 0.6s. I would guess the pit lane is somewhere between 100m-200m nearer 100m. So you can choose to push your limiter right up to 60 to try and save a couple of seconds over two pit stops but risk losing 60 seconds of penalties.
Canamant, you could go into the office and get your official speed from there. I’m not sure how the radar (if it’s even radar) works and you are told it’s only for indication. However like you I don’t have a speed limiter so I used the indicator on the board but kept it safe.
I think there is some confusion about how a speed limiter works on these bikes. All the rider does is brake and hit the limiter button. They don't have to judge the speed it's preprogramed into the engine management system.