Good advice, heading over to shop. Was thinking more about this and the filter does make sense along with possibly the cover of oil pump. Not changed because it is original with cast number. But it is possible the relieve valve port is too worn and maybe pushing too much oil by relieve valve when not meant to.
Spring is hemi black. Correct length and compress to 22lb using service manual spec. Plus .060 lock washer in cap. Did add one qt extra on the last run, and it did seem to improve somewhat, but did not resolve issue.