Would an X-Factor, 12-13lbs., be a good league ball for my wife?  She uses a 13lb. Columbia Scout Reactive now, but wants a ball that might hit better for her.  Pertinent specs are:  10.5-11.5mph, medium revs and track, 154 average on typical house shot on synthetic lanes, and she throws either a small swing shot or a down & in shot.  It was suggested to me that the X-Factor line of balls uses a strong core in their lighter weight balls, unlike some manufacturers.  Would the X-Factor be a good choice for her, and what would the drilling be?  Any other Storm balls, such as the Eraser or Eraser PP, be a better choice?  Any advice is appreciated.  Thanks.