I feel like my '03 is still not tracking as well as I would expect either. Thing is, the front Pirellis are from 2006, even though they have plenty of tread on them. I suspect that once I replace all my tyres I'll be happier. Attached are the alignment settings I ended up with when my brother aligned the wheels for me.
Notice how screwed the toe settings were previously. No wonder I got it at such a good price.
I'll just note also that the car has less than 22,000 miles on the odometer so it shouldn't be due to worn suspension. Bushings all seem fine.