Shaky footage and moving foreground with a flash thown in

Hello All

I have a piece of footage that I am trying to track with Mocha and export that to AE for stabilization of the footage.

There are few planes I can use and the one I am using is dark and grainy. the other problems are that eventually the movement of the footage causes that plane to disappear at least partially, there are people walking down an aisle in front of that plane and get a little in the way and lastly there is a lot of movement from all the people in the shot.

You may have guessed, this is handheld wedding camera footage. I would really like to at least smooth the motion if not totally stabilize it.

The biggest problem comes when the photographer's flash goes off and causes a frame to be really bright. It seems that mocha doesn’t like it and the whole spline twists and ruins the track. Just wondering, would resetting the spline fix the problem?

Any and all help appreciated