Every .45 ejector I have is either angled the opposite way, or it's square on the tip.
I understand what you are saying.The pic of the OP's stock ejector shows the ejector face at an ACUTE angle with the top of the ejector.This puts the point of contact as high on the brass as possible.
If the extractor hook is at 3 oclock,and if the ejector contact was at 9 oclock,the brass would come out at a horizontal flat spin,if it did not contact the slide below the ejection port.
For that reason,lowered ejection port is a popular thing.The ejector is not quite at 9 oclock.Maybe 8 oclock.
I am accustomed to seeing the ejector the OP pictured filed a bit so it is an OBTUSE angle with the top edge maybe 100 deg or 110 or so,to the top edge,for a flat maybe 3/32 down from the top edge. This lowers the ejector contact on the brass,so in tandem with the hook,it gives the path of the brass some more "up" to climb out of the port.I just looked at a Commander clone I have,its angled obtuse for about 1/8 in down.It runs good.
I've changed ejectors before.Its one of those "simple little jobs" that is easy to mess up. I cheat and use a Bridgeport. I have it down to EZ. No problem.
The post that goes into the frame needs a 1/2 hole for the pin. I hate drilling 1/2 holes. I depth mic from the top of the frame to a pin gauge in the hole.
Then I use a little ball mill to mill the 1/2 hole in the ejector post,Likewise,a few measurements allow me to mill the sides and top of the ejector to match fit the slide.Sneer and tell,me you do it with a file.My respects! After 30 years or so,the Bridgeport IS my file.
So I can just boldly file the tip of my ejector to lower the contact point if I think that's the answer.
I hesitate to suggest filing the ejector tip.Supposedly this gun ran with that ejector. Filing the ejector makes the ejector shorter.Its already short.
I might look inside the slide below the port for brass stains,or use marker ink to see what the brass may be hitting.
I can tell you I might order a new ejector and pin to be prepared,then on MY OWN gun,I might try filing the ejector so the face is sloped back some at the top,so it smacks the brass a bit lower. If it doesn't work,I shrug and fit a new ejector. Its on me.
I don't really want to tell you,Tunnelrat,to just grab a file and start cutting steel. I don't know that its the right answer for your gun.