Hi Brian ... nice subject , perch is what it is !! Do not mind that much .
Personally I think it is over sharpened and is carrying too much blacks and contrast .
If you sharpen mild ... wonder where it is coming from . Just taking your C1 edits as described .... you sharpened the image three times ( only in C1 ) as structure/clarity and sharpen !!! As all are sharpening tools using different radius for their work , targeting different frequencies . Depending on the used values ... it can be unfortunate for the image .
Just to give you an idea on my usage of those three tool , sharpening 250/0.3/0.6-1 , structure never touch it , clarity ( natural) 5-10 never higher and only locally via brushing . Just my WF .... not saying anyone needs to copy them
TFS Andreas