Hello @KOwopetu123 ,
the spectrum analyzer shows that you are in a very interfered area.
You chose the right dishes, but you need smaller channels to transmit more capacity and have a good Received signal level. The power lines will not affect your link at all. Also, can you share a picture of how the jumper cables are connected from the radio to the dish? They must be similar on both sides of the link, otherwise the signal will not be optimized at all. If now, at night you get good capacity, it is because there is less traffic over the air and radios are not busy transmitting.
Please, do share a picture of the installation. I will assist you further to sort the issue.
From LINKPLanner, you should expect this signal:
Sincerely yours,
Niragira Olympe