It could be skipped steps, a warped Z axis, lash in the axis. It doesn’t look like ringing to me.
If your steppers run too hot or against too much resistance that’d be the first thing I’d check. As well as give the axes a bit of a yank and ensure it’s all to the German spec.
Ok look advertising has clearly done a number on your brain because that is a removeding absurd amount of money to spend on a chair.
Like nothing in it is worth that much, you can get a very comfortable chair for 200 usd. You’re not getting 1000 usd extra value from this, just think about how much money that is and what materials this is actually made of.
Things marketed to business are absurdly overpriced because spending someone else’s money is easy, but you don’t need a chair adaptable to any body shape and capable of taking 500 kg of load. you know what body shape you are, and you probably aren’t that heavy. Features that sort of make sense in an office environment if you’re high on your own farts are completely unnecessary at home.
This is about status, hence why OP literally leads with a brag about how much money they can afford to light on fire in this post.
Hell medical evidence suggests you don’t even want too comfy of a chair because you should move around and engage your core muscles. Stuff like lumbar support is actively harmful to most people.
So get a nice chair sure but it’s a chair, you shouldn’t spend 12 weeks groceries on abs, mild steel, polyester, and maybe some polycarbonate. That’s stupid.