If I like the way a Babolat Pure Drive plays with a monofilament synthetic gut @ 60 lbs., my understanding is that if I were to switch to Luxilon ALU, I should string at 54 lbs. (10% less) to get the same level of power. But what if I use a natural gut for the crosses? Should I string the ALU at 54 lbs still, but string the gut crosses higher (still at 60 lbs., let's say) to compensate for the greater power? Or should I raise the tension of both the ALU mains and the gut crosses higher than 54 lbs.?