(( UPDATE: 08 NOVEMBER 2018 ))
I've been fighting this "ejected brass into the forehead" business for over 1-1/2 years. I tried a couple of things since my original post, all with no real fixit.
WELL, I think I discovered the fixit a couple of days ago.
---- With a magazine inserted & the slide fully back, I "finally" noted, while looking down at it, that the top cartridge was pointed a bit to the left of the feed ramp/bore centerline. So I used pliers to bend the magazine feed lip area so that the cartridge pointed centerline, or slightly to the right. PROBLEM SOLVED !!
And I was also having the same ejection problem on my other P's ...... P90 (older), P90 (newer), P97. I noted the same problem: top cartridge pointing left. So I adjusted those magazines.
---- I also did one more mod: using pliers, I bent the ejector tip to the left (slide release side). So instead of the ejector pointing straight ahead, it now points slightly left when you are looking down at it.
---- The P97 ejection is now the most amazing: up and back, way over my head. The P90's, both now energetically eject brass to the right.