Saw some funny stuff near the end of the lap...
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That red line (replay) definitely doesn't look to be err... On the money. I would hazard a guess the replay file has either a lower resolution or the replay has some other kind of averaging going on where it doesn't care what data is being output as long as it's approximate over the course of a lap and plays to the screen how it should.
It explains why I didn't think about it before. Earlier replays I saw the max throttle bouncing between 254 and 255 and just dismissed it as I had to clean the throttle pedal on my CSL Elite due to the potentiomenter being a bit bouncy at low values so just assumed this was the beginning of it.
I have also thought that could this be some weird artifact where the live data is actually being smoothed, and the replay has raw data and this sawtooth effect is the vibration from the trigger controls, but I don't see under braking and I don't see it on all corners, so I dunno.
I think for purposes going forward I am just going to ignore replay files when it comes to any kind of analysis or development because it's just... weird.