I have noticed that prestrung Speedport Pro White comes with stretched head. After strings are cut out head compresses (becomes shorter and wider by couple of milimetres). Strung again head shape remains the same as unstrung. Anyone else noticed this? I don't know whether Prince stretches head on purpose or this was just a ''bad'' string job. I say ''bad'' because my prestrung racquet plays much better than restrung one. How the racquet should be strung to restore its prestrung shape?