WN570HA1 low power fix?

Hello

I have the above outdoor high power AP device, which had great power with std firmware but was made pretty useless by std firmware !

Love the OpenWrt implementation, its so so good on anything but on this device I need to set the power for 2.4Ghz back to the 1000mW to get the range back, before it easily reached wifi cam at ~90m, now drops out at 25m !

Firmware only has option for 20dBm/100mW, is there a way of setting that to the 1000mW ??

Cheers
Justin