That is one thing that is known on the Z poor paint, It's something your going to have to live with, Or hit up a paint booth and get ready to drop $5,000 - $10,000 easy. And to fix your scratches and swirls watch this,
Junkman's "How to Completely Repair Your Paint Damage - The Videos! and
The PC-7424XP Orbital Polisher - Can it Damage Your Z's Paint? The Junkman knows all. GL