Morning @dulu, That certainly could be the case, however, by everything I read in the FCC Test Results, it appears that the unit is more/than/capable of handling -30dBm. I've reached out to TP-Link...

In reviewing the FCC Test Results, it appears the EAP225-Outdoor is capable of Transmission Power (TX Power) approaching 30dBm when selecting some of the Higher 5GHz Channels. See screenshot below of...

In reading other posts about Beamforming, it appears TP-Link does not expose the option to Enable/Disable it. Their standard answer seems to be along the lines of "if you use AC to connect, it's...