My daughter is 5' 1"@ 105 lbs and swings a CF5 32/21 bat. I want to get her another bat and am wandering what to get her. She has a fast swing with the 21oz bat so when should you ever move up in weight? Should I stay with the same or go to a 32/22 or a 33/22? What is the plus of swinging a heavier bat as long as you can swing it fast enough thru the zone?