No matter what angle I looked at this movie, I hated it.
It failed to work on any level, but the action scenes were cool.

Try taking your idea down a few notches. I think you're expecting to be able do too much with too little.
Try just cutting the asylum bits and maybe the death scenes and then seeing if you can make it make sense from there. IMHO cutting in bits from other films NEVER works in a fan edit.

If you really want to fix this movie, build a time machine, go back in time, smack Zach Snyder in the face, and tell him to do another draft.