I put collision box shape around my dominos, and after I did that they started bouncing around a little and four of them disappeared. Also I can't get my dominos to rest on flat plain without shaking.

hey someyousomething , a few things to check when things are bouncy are increasing the rigid body world steps per second, increasing the deactivation threshold, increasing the friction and decreasing any bounciness, and making sure that any collision margin isn't poking through the ground by default. 

Hope that helps!