One more important point about David Ferrer...
He plays with a wrist band on his right wrist. This effectively adds to the weight of the hand, necessitating a much lower MgR/I value than without one. If you think that this sounds ridiculous, go try hitting your normal forehand while wearing a wrist band -- it noticeably alters your stroke.
POG OS. 368 SW, 12.54" balance, 21.0 MgR/I.
Problend kevlar 16 / Prestretched SPPP 17, 72/50 lbs.