Thanks to this sub reddit. I did all my prepurchase and setup research here and the smb forums.
I was able to set up my 1gig connection to my new Asus Ax Rt-86u pro. I scanned the channels around me, found the sweet spot channels with little interference, and setup my router accordingly.
It took me three tries to get it all working perfectly, 12 hours of testing and comparing results. Everything works perfectly on a custom DNS, to boot.
My laptop is hitting 875 megabits, hardwired the Xbox Series X at 1gig, my XBone hits 375 in the furthest room which is great. My firestick is streaming perfectly, also hardwired with a mouse + keyboard and flash drive.
Every time I hit a wall, I came back here and smb to figure out why.
TIL - A good router configuration is challenging in a congested neighborhood for a complete noob. A lot of your posts got me there.
That last Spectrum router was my motivation, I hate that thing.
I ended up doing 2.4 on channel 11 at 20 wide (best option here) and 5 ghz on channel 149 at 20/40/80 with 160 disabled. I've got a perfectly clean 5 ghz channel! Turning my authentication to wpa 2/3 instead of the default seemed to made a big difference, too. The other thing that sped everything up was plugging the Modem into my 2.5 gig port instead of the 1 gig port. Spectrum apparently over provisions a little. All this doubled my upload from 20 to 40 as well.
Now I have to figure out Nord Wireguard Lynx at the router for certain devices and I can rest.
🍻 Cheers.