I've broken in many Nova engine now and I hate to say this but I've never replaced a rod after break in. I think this is a money spinning idea injected into our heads by the company and it's represententives. That's my 2 cents worth. All my engine have done well over 25 litres of fuel and not one ever had rod failure.
AMGRacer those NS3 are a tight motor from what I've seen at the track.