HTC Vive Pro & iMac Pro Rendering Issue

We have created an 360 VR video using the HTC Vive Pro on a Windows PC using Unity. We've recently tried to transfer the project over to a fully spec'd iMac Pro (using OS X not Bootcamp). Whilst we've got the HTC Vive Pro to work fine, running our 360 script is problematic as it doesn't seem to render correctly both on screen and on the Vive.

We think it's a setting on Unity as the script builds & runs fine on a really old laptop. We'd really appreciate any suggestions!

Here's on the iMac Pro:


and here's on the laptop (zoomed out):