I've never really truly understood the various blending options in APG. I've revisited one of my "Land Rover in the desert" 360 videos to see if I could fix/improve the parallax problems on the car close to where the camera was mounted on the pole.
Having played around with various settings (raising the threshold for discarding control points, setting "Multiple Viewpoints" on, playing around with blending options), it would seem that I can get a MUCH better result than this:
Your video: - smooth preset. I would have used hard for this case to get a better car. - you need a better blend on the sky to prevent the blacker part in sky compared to other gopro ( beta4 will fix that ).