There's no way Pacific natural gut is softer than Wilson or Babolat natural gut. I tried a couple sets of Pacific and they felt much stiffer than Wilson or Babolat natural gut. Keep in mind I am talking about non BT7 Babolat gut here.
I like Ltec 4s for it's tension maintenance and overall complements VS/Wilson/Prince natural gut mains. Kisrchbaum Evolution is also another good poly cross.