TX power in “status” looks like it is the EIRP calculation (allowed power - antenna gain value set), without using the power set for “all rates fixed”.
External devices measuring power (e.g. other MT AP or client APP) do show further reduction of the emitted power if “all rates fixed” value is lowered below the above calculated value.
This makes the “all rates fixed” so unpractical. Where does it start functioning? I still use the “antena gain correction factor”, which normally also is supposed to take care of the frequency specific limit and the needed reduction for higher MCS. See “Ron Touw” presentation, last minutes … http://forum.mikrotik.com/t/hap-ax3-wireless-problem/172468/1
@Normis answered on this earlier with … something I didn’t like. ( use card rates, antenna gain is physical, …) in 6.47 release discussions… but I’m glad it’s back in wifiwave2.