You might try larger diameter bullets, I run .358 in my 9mm and it is pretty accurate. Just behind my .45, even though I worked harder on the 9mm than I did on the .45.
I think that depends on where you shoot the most. Some matches are out to around 100yds, others much shorter. Zero at half the distance between the closest and furthest target.
If you have any other brass. load up 20 or so and try them. Possible, as mentioned above, that the primer holes in the brass are a little large. If they all work, then that was your problem.