Where you are standing and background noise has a lot to do with (perceived) string noise, sometimes it is there, and later gone. Nearby walls, fans, or traffic can have an effect. When I shoot at the office I cannot hear any bow/string noise at all-ever!?
Try a skinny D97 string (50#=6 strands 60#=8 strands) with the loops padded to 14 strands. Fur does not always work on a problem set up; you may have to use heavier arrows or cat whiskers to quiet your bow. Check your nock height and nock fit.