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Hello, what is your question?
Have you driven the vehicle in order to get all of the air out of the oil system? have you tried replacing the IPR yet. The IPr can cause a slight misfire but it is random. The cylinder 8 contribution is a very common ghost code caused from the revised camshaft sensors. Ford knew of this issue when the recall for camshaft sensors was going on but did nothing to correct it. I work with a guy that just had a very similar concern. He replaced injector 8 three times for the failed contribution code. It ended up being the IPR causing the concern. This was found after installing the injector kill box and it would still randomly cut out even after cylinder 8 was already disabled.
Check the connector for the injectors under the valve cover in the gasket harness, they have a habit of backing out, push the connector in tight and retry, if this is the problem there is a small clip to install to prevent this from happening. Let me know if you want the number for the clip.
Compression can play into this but I don't think that is going to be the issue that you are having?
The part number is ***** AB.