You must be way off on spine or center shot . When I got my bk2 and got it tuned it slamed broadheads and field tips in the same hole every time , a pleasent surprise as it has taken me alot of fine tuneing with other (one cam) bows and some of those still will not group together no matter what I do . You might try bare shaft tuneing out to about 15 yards . Bob Ragsdale calls this the spine test and you will have a hard time getting it right if your spine is off .You might try beman matrix 460 or acc 3-71 for a quality arrow those came out spined corectly from the archery program . The goldtip you are useing are off the chart on the underspined side .

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