My car has this 'whistle' also. I've asked about it before here but no one seem to know for sure what it is.

I've since come across this TSB that seems like it may be what we're all hearing.

Oh...and Adam, just a bit of advice. Posting in one BIG paragraph makes for an annoying read. Breaks up your thoughts my good man :p

__________________
Chris
1985 300SD - 'Grace' (198K mi.)
2018 Honda Civic Sport
2018 Honda CRV LX
2010 Honda Fit Sport (RIP)
2013 Honda Accord Sport (Sold)
1996 Lexus LS400 (Retired)
1995 Ford Contour SE (Retired)
1976 Porsche 914 (Sold)
1972 Datsun 240Z (RIP)