Just to chime in - projections are not changing anything here. Projections are for projecting a spherical image onto the plane, but the initial spherical image is still assumed to be taken from a single point by rotating the camera.
We just released PanoVolo 1.9.0 - panorama stitching software. New features:
DNG File Format Support: Panoramas can now be saved as linear DNG files. DNG is an open, lossless compressed image format developed by Adobe. PanoVolo now supports...
I was able to get one of the batteries replaced out of warranty by going back and forth with their service. I think it was for a very low nominal fee. This was before tariffs and we are in Canada anyway. They do know it's a design flaw.