I am currently using this frame as well. It plays really nice at around 58-60lbs (maybe even a bit higher) provided you use a nice soft multi or gut in either the cross or as a full string job. Bear in mind that the racket has immense power so you don't want to string it too low as the control will go out the window.
However if you are stringing full poly....then I would suggest maybe 54-55 lbs. Although, these are just my personal preferences, yours may be completely different...hope it helps.
