Put an Octane Object tag on EVERYTHING, or, at least, the parent objects.

From Dino Muhic: This is how you can do it —

Off the top of my head, I would do this. Just click on the Node Editor icon in the HDR/Texture Environment attribute panel. I used a Multiply node to integrate the noise, but you can use any node that will suffice...

Have you tried using an Octane Object tag on those items?

Hello, have you reviewed this link? It could be helpful...

https://tomwitte.com/blog/aces-settings-for-after-effects

Try enabling the "Image" toggle...

Ray epsilon?

This has been addressed in the 1.6 release...

It looks like you are at the limits of the algorithm, unfortunately. As others have written, co-resident polygons that are perfectly aligned create a precision issue that results in artifacts such as these, and the typical CAD tesselation is doing this no favors.

Can we see your scene file, please?