I did not look back in your posts or recall what year your hull is...
To me that looks like the built in "hook" from the factory !
If it is not on the center out panels and only on the middle panels.
It is the hook..
That was built in for safety to keep you from to going over at WOT..
Basically keeps your bow down while under way.
I took the hook out of mine on the original rebuild..
Also why I have 24 inch Bennetts which is the only part of the boat in the water when at WOT..