You have a lot of parallax issues due to an excessive overlap between pictures. It create a lot of ghosts as well. That said, can you just open Group settings, optimization tab and select Distortion: Optimize 1st order and Viewpoint: Optimize. Click OK then detect.
In those areas, as you can see, there are not a lot of details (homogenic surface on the 1st pano, too much overlap and a variation of the nodal point in the 2nd pano). You can use Control points tool to add automatic or manual control points to improve the stitching. You can also set Quality of detection to High/Filtering model to Homography. What is the drone used? Do you use a specific app to shoot the pano?
Use the move tool to put the boat up. In Detection tab, Quality of detection to High/Filtering model to Homography. Optimization tab, Distortion to 1st order and Viewpoint to Optimize. That's it! Render settings are the very default.