Yeah thought it might be something like that thanks. Just looking at the AX55 only £90 at the moment. I will wait and see how it goes with my existing setup first then consider a dedicated router.
The Ax55 is great, I am using one myself as a dedicated Quest 2 router.

Just, it's another rookie mistake. That Latency measurement isn't the in game latency. It's the desktop latency. To see the actual in game latency you have to go into the Streaming section in the Virtual desktop menu and enable the "performance Overlay" It will show your FPS, whether there is reprojection of not and it will also show your overall latency and the latency at various parts of the pipeline. Like encoding, decoding, game and network.