Limitations of the Rig

There is an issue with the Rig in that when you bring the arms/ hands up to the face the rig begins to break and deform. I would have liked to do some nice animations where Frank scratches or strokes his hair and rubs his nose. Unfortunately I was unable to do so despite many attempts of experimentation with the rig. I tried switching from FK to IK and switching the SC solvers to RP solvers but there was no difference. I assume it is due to a weighting issue.