The controller will limit ERIP to 20 (radio conducted power + ant gain = 20dB). Even if you configure it for 36 and disable ARM, the controller will set the max EIRP for the AP to 20 (the regulatory max).
If you set the max ARM power to 17dB, the controller will set the EIRP of the AP to 17 (radio conducted power + ant gain = 17dB).