Well, I took a look at things while I was cleaning the gun tonight. The ejector plunger seems to be working freely, and is pretty strong. I cleaned under the extractor pretty thoroughly, and played with some of the empty brass that I fired today. The problem seems to be case specific. Some cases it will extract, and eject forceably, and others fall out of the bolt face before they are ejected. They do ride on the inside of the receiver ring as they are supposed to for a short distance. I will try stripping down the bolt, and thoroughly cleaning things. With Remington bolts I have used a penny to hold the striker back while unscrewing, and cleaning things. It seems to make it easier to reinstall. There is / was just a big enough notch in the bolts to hold the penny / dime.
My gun is the SPS too.