Ahofle,
Yeah, they have definitely broken in over time. They are near perfect for me now. I love them, actually, although definitely not the best feel for fighting games IMO (I have a modular panel with supers). Also, I think also that RandyT's suggestion to grease every 49 way with white lithium grease is also definitely the way to go. That way, they are a little better centering and don't creak.
Hope that helps.
Cheers,
KenToad (aka Retroblast 49 way reviewer)