I thought I heard sort of a whistling noise in the first video, is that the noise your referring to? If so, I'm wondering if its the air rushing past the throttle blade. When I had my 08 wrangler ( yes, different engine, I know) at light throttle I would get a whistling noise do to the throttle being at just the right angle. They all did this, it was more pronounced on jeeps with aftermarket intakes and was a common complaint. Do the run coolant through the throttle body on the pentastars? Maybe you have condensation building up in there and freezing overnight, maybe causing the throttle blade to not move to where it should and the air rushing over it is causing the whistling. Plugging your block heater in may have heated the coolant up enough to keep this from happening. I know, its a long shot.
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