L23UGSR-5HaxD2HaxD On strong signal low Tx/Rx Rate SOLVED

On my link 2450m Netmetal ax 24db antene firmware 7.15.3 channel 5805 united states Tx/Rx Rate 300Mbit BT about 200Mbit udp signal -66 becasue trees in line so I move one side to clear line now signal -49 and Tx/Rx DROP to Tx/Rx 6Mbit link unusable.
When I setting channel 5180 there is lowest tx power Indoor channel Signal drop to -67db BUT Tx/Rx rate jump to 300Mbit and link stable 200Mbit BT.

Today I load new firmware 7.17.2 beta to tray Superchannel on both side changeing to superchannel and on indoor channel 5180 signal jump from -66 to -47 and Tx/Rx rate reduced to 6Mbit Link again unusable . So I tray reduced TX power on both sides to about 10db signal down to -70db BUT Tx/Rx Rate jump from 450 to 500Mbit I try more channel outdoor too and when I reduce TX power to very bed signal about -68 -71db link is relative ok but when I recive NOISE on this weak signal from other AP then link go problem.
Has anybody this problem too ? or I need setting any ? thanks sorry for my english
channel 5180 us country.png
Netmetal AP superchannel.png

Link on 2450 m I had setinig Distance 2km after changeing to 3km All work good