Don’t know if this will help you, but I know it helped me. I downloaded the HINT control app, and set the 2.4 GHZ channel to 40MHz, and the 5GHZ channel to 20GHZ and my download speed doubled, and my upload speed nearly tripled. When I tried configuring it to have the 5GHz channel be the strongest channel on the router, my speeds decreased by over 15-20%.
That no QCI hurts definitely. Selling excess spectrum instead of making the network for this product... yes 30mhz is a decent amount of spectrum to see improvement definitely. Cellular is so much better and that ping is solid