I agree with Kirk. If the limbs aren't in balance/properly tillered, they'll increase hand shock.
That being said, I've owned a few Ghosts and have never had a problem with them. As others have pointed out, a low stretch string helps reduce hand shock, as does a heavier arrow, though yours appear heavy enough, and a raised brace height.
A tight grip can only increase felt handshock because the excess energy has no where to go but into your hand. A looser, lower wrist grip, as Kirk recommends should help.
Of course, the lighter the bow/riser, the more likely it is to pass on the excess bow energy to the bow hand in the form of handshock. A heavy riser absorbs a lot of the excess energy/vibration. The Ghost riser is short and light, but as I said before, those I've owned have always been well balanced and did not impart a lot of hand shock. Good luck.