I'm not exactly sure what the RPM was the day of the video. The most recent RPM taken was 1783 RPM with the same type of oscillation. The other 2 motors were running 1796 RPM.
I am currently running the following for my P vue setting.
1K Hz HP filter / 100 Hz Fmax / 1600 lines / 1 average Can you post the latest of this data with a vertical scale which shows 1x near 75% of the full vertical scale?
I will give your settings a try. The plants have not been running much lately due to the flooding in Nebraska, the trains aren't coming like they should be.