@ljwobker, here’s a different view of your power quality data from a little different perspective, against a few other users’ experiences. The chart shows the comparison of the offending min vs min or max vs max for the two legs. Yours is the first chart. And as you suggest, L0 is stable and and L1 is the sole deviant one, except for a couple points.
User 5 - both legs shows issues with 100% positive correlation - both go up and down together, a power company issue.
User 2 - both legs are negatively correlated, probably a neutral issue. One goes down when the other goes up, almost linearly.
User 1 - runs mostly on their own generator, solar and their own batteries.
Your issue looks closest to User 4 and User 3 (with legs reversed). Maybe I can check I with them to see if they ever diagnosed.