Thanks for the analysis @kevin1. I believe the symmetry between Leg0 and Leg1 doesn’t rule-out the issue potentially being related to the starting of a power hungry 220V device like an A/C compressor. But it also means it could be another type of problem that would be common to both legs.
I think cases like this further demonstrate the potential value of my suggestion under the post below. It would be great if Sense could give some insight into what may be causing the dips, especially for the big outliers. Because as of now, I’m still at a loss regarding how to solve this.