Well it seems to be all good, am still getting consistent speeds over the weekend.
Additionally, I wasn't booted from Warzone all weekend since the change and my wife's stream didn't disconnect. We had been having issues with the new router (I think DHCP lease renewal) that would disconnect just long enough for a problem to occur.
From what I can tell, that all vanished with the change back to the XR500.
Fraser - thank you so much for the help! Greatly appreciate it, even more