I'm using an MT7621 router and my 5G settings are at 80 MHz, but what channel should I set it to?
Should I set the country code according to my country of residence, or to the country that provides the best Wi-Fi performance?
How long is a piece of string?
The channel you should use depends on your environment, so nobody can tell you what channel to use without being at your location and performing an RF scan to find the least congested channel (that is what you want to find). OpenWrt can do an RF scan to help you with that process.
Set the country code to your country of residence. Any other settings are illegal. The whole purpose of the country code is to ensure that your device is operating with the limits allowed as a function of regulations in your country.
You should set country code to your location. 5GHz regdb is also enforced on clients, you will not gain anything setting one side to illegal excessive power.
For performance you should increase cell density setting. This also limits range excluding corners where performance would be abysmal.
Best approach to coverage is to survey the coverage eg https://play.google.com/store/apps/details?id=com.ubnt.usurvey&hl=en-GB and move AP within one wavelength ~20cm to avoid obvious obstacles.
How many dbm should I make my signal strength for the most stable performance in 5G Wi-Fi?
Keep it do driver default, usually depends on channel, that will select best power possible between hardware abilities and regulatory limits.
The "best" depends. If you want voip or gaming you have to exclude low link rates via "cell density".
Do the survey, screenshot picture if you cannot figure out obstacles.
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Just run channel analysis at https://192.168.1.1/cgi-bin/luci/admin/status/channel_analysis and choose the channel which is less busy for you (or free, as in my case). Don't choose DFS channels (depends on your country).
P.S. don't violate your regulations. They do monitor it in some areas like military bases or airports. They have means to find you if you're annoying and loud enough.
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Couple of hints:
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Your country has a regulation. Choosing your country in the router ensures that regulation is followed.
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More power does not necessarily mean more speed. You can shout loudly, but if other part whispers there will be no talk.
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Your devices (phones) will not even try to shout. iPhone runs around 18-19 dBm for WiFi.
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You do not set "channel" when using 80MHz. You choose beginning of channel. If using 80Mhz, you will span across 12 channels. You are basically forced to use 36 for UNII-1 and 52 for UNII-2 (if allowed by DFS) Choosing 44 with 80MHz will put you between UNII-1 and UNII-2 band and probably fail or limit you to 40Mhz. If using 80MHz, you basically have no choice but use 36 or (if regulations allow it) 52, 149
If you need speed, you can try using wider channels (which will work as long as you have coverage and no overlapping channels). If you need coverage, you add more access points. If you need both, you need to plan your channel distribution and perhaps lower (yes, lower) your power.
There is no free lunch.
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Take a look at this pic. UNII-1 is only one guaranteed to work, as long as it can fit. Everything else is "maybe" (if country regs allow it AND DFS does not hear anything on that band AND you can fit your desired channel width into contiguous block).
Tricks like changing regs and cranking up ERP on UNII-2 extended is just asking for trouble. You might lit up at some airport radar and they will know where you are, its in radars nature to know such things)
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