I have been testing different natural gut/poly hybrid string set ups in my RDS001 MPs using Babolat VS and Luxilon Alu Rough. I tend to string on the high end of the tension range to optimize control. I currently have one frame strung with VS on the mains and Lux Alu Rough on the crosses; another frame is just the opposite. I can definitely feel the difference between the two set-ups. I remember reading somewhere that tour pros are pretty evenly split on gut in the mains versus gut in the crosses. What are some of the reasons for stringing gut in the mains? Gut in the crosses? which set-up do you prefer?