Issue: After noise removal the background noise is undetectable when played in CS8. After production all reduction appears to have lost.
Before extra detail is posted the answer to the following question may be the difference.
Is there a difference in sound when using "CS8 File > Produce Special > Produce selection as..." and "Produce and Share..."? Specifically, are noise removal changes applied to the Produce Selection in the same way they are to Produce and Share or are they honored in the latter and ignored in the first?