There is no doubt in my mind that you should pull them. There was a time not long ago that I weighed each bullet and separated them by weight before reloading them. In the typical box of 500, most were within 2.0 grains of each other, however, there were always a handful with were 4 grains over or under the stated weight. These were .38 and .45, which were probably heavier than your 9mm, but you can see that plus or minus 4 grains is much more than your powder weight. As coincidence has it, I just pulled about half of a batch of 300 9mm which did not plunk. I'm sure that I have not pull that many in total for the entire 35 years that I had that kinetic bullet puller. Lesson learned.