Not to discount anyone else’s experience or knowledge, Tikka uses a through hole, right to the pin. Your ejection issue is likely related to ejector spring pressure and forward positioning of the extractor.
You think it’s set to far forward?
It’s hard to say what it’s doing without having it in hand, but the farther forward the extractor is the less angular work the ejector can do on the case head. I’d just try a new spring and see, but you can also alter the notch on the ejector to get a little more throw out of it.
