More photos is not always better. I shot a 1,400 photo synth that actually turned out pretty poor to navigate or experience what I was trying to capture. You might try recreating the same synth with fewer images to see what images you need and what shots aren't.
As for getting things to rotate correctly. It looks like the synther didn't have a zoomed out photo to figure out what the horizon line was... ie, what is up and what is down.