Soda, My sensitivity settings are changed several times every outing depending on the conditions. What they were when pic #2 was taken, I don't know. I agree that the sensitivity looks a little high.
As for the pic itself, despite my failures in settings, I think it shows some bait balls amongst the interference. I really like the bottom soundings in the pic. I see a few structure targets worth fishing.
Pic #1 is a mystery to me. I really like your creek channel idea. My only guess was that due to my slow speed, I marked several fish swimming through "the fan". Similar to pic #3, but not as distorted. I marked it because I was a little puzzled by what I saw and wanted to study it later.
I liked pic #4 because of the few large, suspended fish that are marked in the right SI pane. I marked it more for the waypoint that day so I could turn around and hit them with a crankbait. I boated none of those fish.
My main reason for sharing these images is to glean any knowledge that some of you might post that I might not have already thought of. So far it's working so please do not hesitate to post any ideas, no matter how crazy you might think they are.