Are you a tournament player??
Breaking racquets and strings like this is hard to believe.
I haven't played with the yonex 89 tour , but I know a couple of people who do, so I'd look into that, Yonex quality is very very good.
2X YY 97T 310 with YY PTSPIN 47/43. ---Yonex PC Light, waiting for VCore TourG. Stan is the MAN.