The first image you posted shows the left side a lot darker than the right. I am having the same problem. Have you found a way to correct it?
I had the same problem.
I made my own trasducer mount and I put it under the boat. Its still in the back but just under the bottom and I made the mount so the trasducer is under the ribs of the boat
If you search JIMF you will see some of the pictures of my mount and pictures of side image. Its under new braket
and I titled the trasducer up some on the left side so it will read a little fared out.