I am looking for a ball for my daughter for when the pattern gets toasted after several games bowled. She is a lower rev bowler, avg speed 14-15mph, and typically shoots from the 17 to 10 on the THS. I am hoping to find her something that can handle the medium-dry patterns. She currently uses a 15lb Pure Swing as her got to ball and follows that with her 15lb VG, but both of these balls burn a lot of energy on the drier patterns that she has experienced. Any advice??