He is correct. Suggest 4 images each at 90.
After the 4th image rotation position, rotate your camera straight up to the zenith (top) and take the top image.
Rotate the camera directly down at same 4th yaw angle and elevation, remove the tripod, hold camera at arms length and take the Nadir (floor). Yes we realize we will see your feet. Sounds a bit like rubbing your tummy while patting your head.
OR, use the photoshop action "Glass gazing ball" to replace your tripod head.
Then try the 4 +T & or B
The other Dave
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EasyPano - Panoweaver