I have two martin courgar bows. one is a 2000 fury X. 56# at 27 dl. shoots like a dream. the other is a 2003 cougar with nitous X cams. 48#at 27dl. it is a nightmare. will not group good. timing on cams is perfect. BH is right. the only thing I can find wrong is the ata is out by about 1/8 inch. on the left side. when I adjust it to equal the right side the cables on the right have a LOT less tenison on them. this dont seem right. would appreciate any help. also have put on new string and cables.