Hi, I've been using Luxilon ALU Power (silver) in my Bio F2 Tour's. I don't live in the US, so getting the strings are hard, and expensive, but not impossible. I've tried other poly's and co-poly's, but I prefer the ALU's. However, it seems a bit of a waste in a full bed, not to mention expensive, so I'm looking for a synthetic gut (not a multifilament) to use as a cross string - that would "interfere" with the ALU's characteristics as little as possible, if that makes sense? Any suggestions?