I assume these were the 8 round mags? They are a bit bothersome to my big hands too, I have a ten rounder that I went totally through that works well so I usually use it when I am shooting, then since it's the wife's bedside gun I throw the 8 rounders back into it when it goes back to it's post there. I never had any problems with the 8 round ones, but then the C9 Comp was well-used when I got hold of it is maybe why. I do know that even now it gets smoother the more I shoot, but I replaced a lot of parts when I first got it so I supposed they are all breaking in now!
The biggest problem is they really like to be fed a lot! It's probably a good thing it's a 20 minute drive to my buddy's house where I shoot or I might be using the milk money on ammo!