nDisplay multi node, multi GPU setup

Hi there!

We currently have a LED wall setup that uses two render nodes, each with two RTX A6000s. The wall is split into quarters with each node responsible for half of the screen. Like in the image below.

We have until now been running this with mosaic and using the VIVE Mars for camera tracking but we are finding that we are experiencing latency issues regardless of how light a load is running.

We decided we would try without mosaic to see if we could reduce the tracking latency but when we created the new nDisplay config and ran it, only the top two quarters from each node displayed anything. The bottom quarters remained unaffected and continued displaying the desktop. I have tried playing with various GPU index settings but with no success.

I know this is rather vague, but does anyone know what the likely culprit may be?

Thanks in advance!