I'm stringing up a Babolat Pure Aero and looking for a softer, slick cross string to give a bit more comfort, energy return and less of the "strings scraping" feeling with my hits. Though I am a fan of Poly/Multi on my Head rackets, I prefer the feeling of polyester on the Aero. I normally do a full bed of RPM Blast 16 @52, and for this hybrid I would like to keep RPM Blast in the mains. For crosses, so far I've heard Isospeed Cream is a great option, but I've also been considering Luxilon Element and some of the softer Head strings. Durability is not too big of a concern with me.