I ran a second, much larger project, capturing the settings screen for each step as I went (some attached, all available)
The same lines came out in any exported images in full resolution, but not when the resolution was decreased.
The same lines are visible when exporting full res TIFFs, but apparently not nearly as many lines.
I was wrong about the lines being broken on taller objects, as it also happened on the surface of the water (attached)
The entire image set for the smaller project is 1.2 gb uncompressed, and I can upload it some where if it would help