On 5GHz I use 40MHz at least (Ce or Ceee) and am using DFS channels as they are less crowded than the 5180-5240 channels. But it has its disadvantages (as well as advantages).
I am not sure if my devices support 40MHz, I will try later, when my wife stops using the wireless :D
Depending on whether you need 6Mbps, you can set basic rates to 12Mbps & 24Mbps and supported 12Mbps and up.
I will try later. To be honest, I don't know what does that mean. Of course, I would like the wireless to be as fast as possible. For example, 2Ghz with the current setting seems too slow for HBO GO streaming on the TVs and I switched to 5Ghz. I would need some time to get familiar with what the heck wireless is. I was a default-settings user until now and I used mostly my ISP routers for wi-fi, which don't work that great. I had some short courses about ethernet back at the university 10 years ago, then mostly IP/TCP and I clearly lack knowledge about RF and wireless. At least, I can get a 2-3 ms latency when running speedtest with this setting and the same or greater speed then my ISP's wireless router (latency was 7-12 ms), which is kind of an improvement :)
Didn't you set country code?
I think so. Isn't it:
add country=bulgaria datapath=RANDOM mode=ap name="random 2ghz" rates=gn_only
security=RANDOM ssid="random 2ghz"
add country=bulgaria datapath=RANDOM mode=ap name="random 5ghz" security=RANDO