Seeing broncosis comment made me think again. The first thought I had was that this was a z-axis wobble. I have had severe z-axis wobble on my old Orca v0.3. However, I locked in on the pictures included with the original post, thinking that the objects are oriented on the print plate as on the pictures. Is this not so?
In the OP’s description, it says “vertical” ripple. Is that one where the wave-vector is vertical, which would be consistent with a z-axis wobble, or where the wave-fronts are vertically aligned, which would be consistent with x- and y-axes wobbles?