Hi. My friend would like me to string his racquet at 65 lbs. He wants me to use this string on the mains: http://www.tennis-warehouse.com/Prince_Tour_16_Silver_String/descpageACPRINCE-PT16.html. What is my approach for these strings? Do I string at 5%, 10%, or 15% looser or tighter than 65 lbs, or do I just string it at 65 lbs? I will be using a multifilament or some other synthetic string on the crosses. Please let me know. Thank you for your help.