Hi
Have you tried the book "Fatal Traps for Helicopter Pilots" by Greg Whyte? I lent my copy to my instructor 18 months ago and haven't seen it since.
It describes the main causes of accidents, one per chapter, (vortex ring, flight into terrain, wire strikes etc), cites one or two crash reports involving each accident cause then discusses how the cause arises and how to avoid it.
Along with my avid reading of the AAIB reports this book convinced my wife I was nutty until I explained that I didn't want to repeat others' mistakes and not come home.
I would recommend it to any other student of helicopters.
Good luck
Ian.