For the spherical panos I do not use HDR. The richness, on that day, came from an ND16 filter. The stitching is completely done by DJI's stitching software. It's all processed within the
DJI smart controller after the photos are taken. Having come from using PTGui, this DJI software is a godsend! It has worked flawlessly. Gives me a hi-res jpg pano, which I have been very happy with. The jpg is usually around 15 mb. I still have the raw .dng files, which I could stitch together using a separate program, but I have not seen the need to do that. I do usually import the pano DJI produces into Photoshop to just sometimes tweak the sharpening, highlights/shadows and colors. Then I run it through an app called "exif fixer" which makes it compatible with Facebook and Kuula.