RBR50 performance degradation after 2.5.0.38 firmware update

So... after reverting my RBR50 and RBS50s to firmware 2.3.5.30, which Netgear considers the last stable release, the network slowdown that came out of nowhere is gone.  However, this doesn't cure the random spikes in latency that were driving me absolutely spare.  After receiving no meaningful assistance from Netgear's dev team, I've opted to just broom my Orbi setup and replaced it with a more reliable mesh system from another manufacturer.  Specifically, the Asus ROG Rapture GT-AX11000 WiFi 6 triple-band system.  It's proving to be much more stable than the Orbi was and thus far has offered slightly better performance, though it's about 1 1/2 times the size and looks like a futuristic take on Stonehenge.