This is what I had to do too. Otherwise my IoT was a mess. When 2.4 ghz devices actually connected my speeds were abysmal. I'm talking dial-up speeds. lol
I have been running 3.0.0.4.384_8011 for about a month without any issues at all, and then, I changed something.
I have an Ecobee 3 thermostat which has an issue with reacquiring an IP address from Asus routers and their DHCP so I added it to the manual assignment list. With that enabled and...
I finally made the jump from 6436 (skipping 7979 and 7997) to 8011. The reason: my work laptop has an Intel AC 9560 160MHz on driver 21.80 which has known issues connecting to the GT-AX11000. It will connect fine but the router's DHCP isn't working right (I assume), on the router it assigns...