if it's feeding fine with the 38/357 , the one thing i would look at would be the trip lever( the one between your station 1 and 2 )and make sure the case is pushing the lever every time- the 38./357 as you know has a rim, and that pushes the lever with no problem- the 9mm being rimless, may have to be set further in( it should be ON TOP of the shell plate ) so the shell body trips it and NOT the rim- the other thing that occurs might be to check the draw bolt and make sure your carrier doesn't move or has gone out of alignment- that was loose on mine and hasn't had a problem since- the procedure on how to do this is on the lee site, and believe me, you'll need a torque wrench to do it right - putting a die in at station 2 won't solve anything but an ALIGNMENT problem if your casing is wobbling on the way up, and the primer is seated by pressure exerted by that 1/4 inch bolt on the left side beside station 3 baring down on the primer arm- that's strictly for setting your primer depth