i'm interested in your setup. are you using macos or another bsd? what kind of ap's do you use? what does your mesh look like? special antennas? thank you.
The power used is very low. More power just means more interference. The bottleneck is the transmit power on the client, which is very low. More power on the AP just make everything louder. I've set up power level based on this document: https://support.apple.com/en-us/HT203068. Unfortunately only Apple documents this stuff, but works pretty well for everything AFAICT.
I don't have any special antennas. If you need to cover a large space with a single AP you might need one, but the best philosophy on 5GHz is to have many smaller APs.
All my APs are connected through ethernet (actually everything is PoE powered). I don't use any mesh stuff (although Mikrotik can be used in that configuration, I don't recommend it). All my APs are simple bridges, I don't use the Mikrotik tunnel stuff.
I don't use 802.11r because Mikrotik can't do it yet. I am not sure if anyone except Cisco can do it. I wish I had 802.11r, this is my Achilles' heel.
Everything works very well, but you get what you pay for. Mikrotik is really cheap compared to the real stuff out there, which means much less polish, more bugs, and no real documentation. If I were to do it again I might chose Unifi[2] instead. Don't get me wrong, this all works very well, but the level of polish is what you'd expect out of a GitHub project compared to some real commercial product. For example while you can set antenna gain in standalone AP mode, you can't do it in managed AP mode. Minor stuff like that.
I also run a RADIUS server and I create user accounts for all my wireless users (WPA2 Enterprise). At different locations users have the same credentials.
I use all kinds of clients (Linux/BSD/macOS), but the ones where I'm most interested in speed are the Macbooks.