It was hard to stitch this pano because of yacht rolling
Wiskey,
I know you've already put the time in and fixed the stitching errors with the patch tool but why don't you give PTGui a go? Download the free demo version and see what it will do with your original images.
A while ago i took some 360 degree shots on a Canadian lifeboat and had a real pig of a time getting them to stitch correctly. In the end I set it to 'manual' control points and just went through the images matching points only on the actual boat itself. (approx 10 for each image) It was fairy time consuming matching points manually but so much quicker than using extract/patch tools and then cloning things in Photoshop. If PTGui was set to automatic points it matched clouds, wave crests, etc and just made me want to give up
I like your picture though. Bet your chuffed with the result.
Andrew