I couldn't get the video to play. I've never had new gears, but I don't think shavings are normal. Are they shavings or powder like?For the price of what stuff costs today, I wouldn't put up with a loud whine. I had a set of used 3.70 gears that were very loud, and no amount of adjustment could quiet them.
That rear rebound situation sounds goofy. What did Shaun say about it? Can you post pics of your car ride height and rear coil overs?