I don't hear a whistling sound from your videos.. did it sound anything like this video I took of my car? Everything you're describing seems like the same issue I had which turned out to be a bad PCV valve on the plastic valve cover which is not a separately fixable part. I had the valve cover replaced under SULEV and the noise hasn't returned at all.
*EDIT* Forgot to mention one way to see if it's a bad PCV valve is to try and open up the engine oil filler cap while the car is idling. If it's extremely difficult that means there is excess vacuum and the PCV valve has likely gone bad causing the whistling and rough idle issues.