In the USA, in PTP UNII-1 allows a maximum EIRP of 53 db, and UNII-3 allows unlimited as long as radio gain is 30dbm. I used to get the radio power up by reducing the Antenna gain parameter to 0. The option to do that appears to have disappeared in radios with attached antennas. So while I’m here with a bunch of Mimosa radios transmitting legally at 200 watts in PTP mode, I can’t get the MT above 1 watt - the radio TX power won’t go above 3dbm. I’m in USA3 regulatory mode PTP Bridge AP.
Any help appreciated 
OK - although I wasn’t able to find it in winbox, I was able to change it in the terminal window
/interface wireless
set [ find default-name=wlan1 ] antenna gain=0
The radio is now running at 30 dbm.