Problems have been reported with newer versions of the TP-Link AX 1500 routers. Not seen anything about the TP-Link AX3000 though. Video on routers here:
The BEST and CHEAPEST Routers for Air Link & Virtual Desktop
Also this guy has tried various connection methods for VD and the Pico 4 including WIFI 6 dedicated router, USB-C tethering with VD, and finally Ethernet cable to USB-C adaptor, all for MSFS.
PICO 4 | MSFS VR | Performance Test Part 2 | WIFI 6 Wireless Virtual Desktop
I personally have a new Asus RT-AX55 dedicated router situated about three feet away, along with a 4090 and 5800X3D. I have Godlike Mode set, DLSS Quality settings, SteamVR set at default (150%) and then crank up the resolution in the Toolkit resolution override. I get network connection at around 4-9ms in VD, latency around 70ms, but gameplay is smooth and stutter free on my Pico 4.
I would suggest downloading the free open source WiFiAnalyser app on your phone and check your locality for 5GHz traffic that may be interfering with your connection on the same channels. For me, although there are numerous 2.4GHz routers nearby, apart from me there are no 5GHz channels being used at all.
Edit: For some android phones, android 9 and 10 have WIFI scan throttling. This can be disabled in Android 10 by following these directions using developer mode.