That thermocline is showing up great! I see some bait clouds and stickups as well. Based off the 2D shot with the slow speed I can see why the longer lines (on the bottom of the screen) are displayed. If you pick up your boat speed and set scroll speed those lines will then appear as dots (fish) and the long line of bait will show up as a cloud...unless it's large. then it could take up the whole screen depending on your depth settings.
When that happens you will also see your depth go shallow or start jumping. Going that slow and passing over bait with fish feeding will look like one big blob with streeks. Pick up speed and you shouldn't get screen shots like the top one again and you should also see better detail of both fish and structure.
In this shot after setting scroll speed to 4 and boat at 4mph you can see the tree to the bottom right with fish and the detail of the blowed out bridge with a bait cloud above.
hope this helps
Thx for the screenshots and hope ya get a boat load