About your stitching problem: You can produce really nice Panoramas and/or 360° Pictures if you make single pictures and stitch it afterwards on the computer using a Program called Kolor Autopano Giga. It does a great job.

I've been using it for a while now. I also just posted something about that today here on steemit, you can check it out if you are interrested...

https://steemit.com/vr/@pzd3mir/i-m-a-virtual-reality-filmer-or-how-to-make-360-video