How to increase the speed of mikrotik wi-fi bridge?

Question

Computer networks

Good afternoon!
Colleagues, I ask for your help in an interesting issue.
There is a radio bridge on mikrotik Dynadish6, the distance between the points is 2 km, the Fresnel zone is clean.
I'm testing Bandwidth from the Bridge side, (tcp) TX-20Mbps RX-80Mbps :( Tell me
, how can I increase the speed of the radio bridge?
I've already tried a bunch of options, but everything is +- in this area ...
Bridge settings:

adaptive-noise-immunity=ap-and-client-mode \
    band=5ghz-a/n channel-width=20/40mhz-Ce country=russia2 disabled=no \
    frequency=6325 mode=bridge [email protected]@@@@@ nv2-security=enabled \
    radio-name=Dyna ssid=0000 tdma-period-size=3 tx-power-mode=\
    all-rates-fixed wds-default-bridge=bridge wds-mode=dynamic \
    wireless-protocol=nv2 wps-mode=disabled

Here is a screenshot from the station side:

I really hope for you!

Answer 1

You have a bias in one polarization and a very strong one. 3db difference in ch0 and ch1 will give a performance drop in half. And you're in your thirties.
Align antennas.