I ended up individually weighing all of my 9mm loads to be 3.4-3.5 grains. What a pain. If I can't get my measure to throw more reliably I may try a different powder for 9mm.
What measure? If it makes you feel any better I get about a .1 grain variation both up and down with my Uniflow - thus, if I want each round to be identical I must weigh each one and trickle accordingly.