Let me second the advice to number your arrows. One of my Axis FMJ arrows got damaged near the nock somewhere along the way. After awhile I started noticing that arrow #3 seemed to always be the flier in what was otherwise a good group. Careful inspection revealed the damage.

Also, I get the impression that the PSE X Force might not be as forgiving as some other bows with less impressive IBO stats. You also might be over-bowed, in terms of draw weight - or just struggling with the somewhat harsh draw cycle necessary to get these speeds. You might be better off with a more pleasant bow that doesn't have as much speed. For shooting out to 40 yards, there isn't much difference in actual performance on game.