Hi Boricua,
Typically a softer string isn't a substitute for rest and ice.
Having said that, Xcite is not softer. After your arm heals, you might try Tourna Big Hitter Black 7, Polyfibre TCS or Gosen Sidewinder. We've found that all of these are softer than Black Shark. Also, you might try adding some weight to the racquet's head as this would reduce shock.
Hope this helps,
Jon