The following web page describes a potential means of eliminating four concerns with the intermeshing configuration. The major advantage is that the blade to ground clearance can now be equal to or greater than that of a comparable single-rotor craft.
Rotor Concept - Intermeshing Rotors w/ Anhedral
Criticism appreciated.
This invention is posted so that it is in the public domain and cannot be patented by one to the detriment of others. 
Dave J