Just FYI, regardless of wireless or wired RBS, There maybe still too much wifi that maybe over saturating your environment or have too much wifi signal over lap between the units, since all RBS are still broadcasting signals, regardless of wireless or ethernet backhaul. This can cause problems...
try turning down the power output of the modems wifi radios from 100% to 50% and see if this changes anything. Under Advanced Tab/Advanced Settings/Wireless Settings. You are in a busy area on 2.4Ghz. I'd use channel 48 or 161 on 5Ghz.
So far, 44266 is working pretty good for me. I'm now seeing near 900Mpbs while connected with the 2.5Gb LAN port while the GT is in wireless bridge mode. Prior versions were seeing around 400Mpbs. I haven't tried router mode yet.
Might review this:
https://www.snbforums.com/threads/2-5g-gaming-port-issue-asus-rog-rapture-gt-ax11000.70947/
Something to contact ASUS support about for sure...
Ok. Until game consoles also support 2.5Gb or higher speeds, I don't consider using that port unless you can take advantage of the connect rate speed. I have a PC with a 2.5Gb adapter installed and have not seen any issues while using it. I mostly use my GT in wireless bridge mode. Router mode...
Since you seem to have problems with game consoles on the 2.5Gb Port, it seems that either the consoles are a cause of the problem or the 2.5Gb port is not stable enough to handle the consoles, for what ever reason. I would connect something that is rated at 2.5Gb speed rates only to that port...