merging images for pan

[dfansler]

I just completed a solo sailing trip from Greece to North Carolina (YouTube "Sailing Solo at 70").  I witnessed quite a few beautiful sunsets which I took overlapping photos to make panoramas of.  Merging the sky easy easy since there is no structure.  But merging the sea is a beast.  I have tried copying a section of sea, feathering the edges and pasting it onto the image.  The feathering turns out blurry and easy to see.  I have tried airbrushing the sections together, again without my success.  Anyone have other suggestions?  Attached is a section of the lastest pan I am working on.
Thanks,

David