help: 5Ghz 10km bridge

it is not for this place but i need help

I have 2x AIRAYA AI108 (left side)
conected as bridge

before they conect two points on 19km with speed ~33 Mbit/s
now we move them to other location were points is 10km each other
but max speed is ~8 Mbit/s needed speed is ~40 Mbit/s
both dishes are 1.2m
cable BELDEN 1.5m
two points have direct visibility

Signal Strength (visable when pinging as TTL) show
TTL=28~34
Time=1~8ms

p.s.
how to use MikroTik Link Possibility Calculator with this data

sorry for my bed knowledge of WiFi tech

interference, water in the middle? first 2 things that came in mind