Yeah when the string and or cable looks all bunched up its twisted too much or maybe when the string and cable feel knotted up, I'd be getting new string etc if it was me, I don't believe the spec is 11in on the money, my timing was good and my axle to axle measurement was 11 1/4in new after 24 shots it measured just under 11 3/8in, so it stretched quickly, I put one twist in all my cables and 2 twist in my string, I will probably put one more twist in each cable soon, but that's it no more, there's no way that bow would make 11in, alot of manufacturers say 10 or 11 inch when its actually over that, prim example my hoyt spyder 30 bow and my hoyt crx 32 bow the spyder actually specs at 30 3/8in the crx 32 is over 32 but I can't recall by just how much, but my new viper measured 11 1/4 inch new so that's probably your target axle to axle