AX9000 - increase singal strength - set txpwr

Hello, I just bought the 2nd ax9000. The first runs with openwrt, transmits with 30dbi and runs quite stable.
The 2nd I want to run with the original firmware.
Unfortunately the signal strength is very poor compared to its brother with openwrt.

Is there a way to set the signal strength higher than the current maximum with the original firmware?