In Affinity 1.5 there will come a lot of helping tools to prepare the equirectangular photos for 360-panos.
There are mostly the same corrections needed:
-> modify the nadir (eliminate the tripod, or yourself...)
-> leveling the pano
In this case normally some vertical or horizontal lines should be defined, and the
software should recalculate the leveled picture, but still remaining in the same size.
That would be very helpful.