Layer shift on Y axis on thin 2 line walls with CoreXZ

This is on a V3 CoreXZ sliced with Creality Print 5.xx . THIS IS ONLY ON THIN WALLS. Other models print great. First noticed on straight Lithophane, not on curved litho’s. Then while doing Max Volumetric Speed calibration noticed shifting along the Y axis. Picture attached. To be clear, the anomaly displays on the Y axis wall, so something on the x axis is causing it. You will notice the walls along the x axis and around curves look fine. Related, on litho’s, there is ghosting on the back side where wall is only 2 lines (.8mm) thick. FYI, Litho’s are typically aligned along the Y axis to minimize vibrations. Ideas?