My new 4.25" 9mm 2.0 ejects perfectly, and consistently to the right, and behind.

I suggest you look a little deeper into your pistol. There is something not quite right. I would examine the extractor closely, for flash or excess coating, and if you can, compare the ejector to another 9mm 2.0 to see if they look the same.

The comment that you think its getting better, makes me think its possibly the coating on the extractor starting to wear in.

Other causes for weak ejection are under powered ammo, and limp wristing.