50 should be fine, at least in US?
I have also tried use CH36 or CH40 in the single test, with the AX200, the same as before CH48, up to about 1.4Gbps.
(In some countries with DFS do pay attention to the channels. But the router will check if DFS can use when it enabled WiFi and work in 160MHz.)
For anyone that stumbles upon this thread, I have now tested on a second unit (Flint 2). And achieving expected results. Internet Speedtests are only maxing out around 700mbps which is kinda weird but i'm okay with that. LibreSpeed results reaching essentially the full 1gbps provided from the server pc. On stock configuration and 4.6.2 stable firmware.
Tested on a Samsung Galaxy s23+ - Which was the most problematic device on the other unit.
You marked it as a solution, but I didn't understand the solution.
What did you do? It was a faulty product and did you replace it?