What is this?

So earlier today, I was thinking that I was having a Pressure Advance issue. I have since run many A PA test, tower and pattern method. It is tuned just right. I tried running with a factor of 0.0001 and also 0.0025. No joy. I still get these repeating artifacts along the edge. They are wavy, and cyclical, occurring every 8 layers or so I'd say.

Any ideas? Happens on 3 edges that are not the seam. If I print the seam in the middle of the part, happens on all 4 edges.
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