I strung a few frames for Nestor at the Winston a Salem a Open at 11 lbs! One of the best dubs players of all times and he strung at 11 lbs!!! Gut and Big Banger at these tensions is a dream. Serves are easier and returns are basically volleys/half volleys. I asked him about/why so ultra low....he said because with Luxilon Alu Power you have the best playing string of all time.....for an hour! He said after an hour Alu Power is garbage! Pros can switch rackets every hour. And get compensated for it. Doubles, you benefit from the added power, spin, and string life due to lower tension and literally half volleying returns.