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.