There's a couple of us on here useing differant models of asus routers mate. Have you installed the Merlin firmware on yours. I've switched off 2.4 ghz and just run 5ghz runs perfect. But all my appliances run 5ghz firestick, cameras. Trial and error mate. But a mile better than super hub 3 I had.
Sure there will be more hep on the way... Paul