Squeal is most likely bearings.
Vibrations can be fixed with sound deadener (that resists heat) at key joints.
I've watched the video and noticed thin sheet metal touching thin sheet metal without any insulation or anything to resist vibration.

Spondoolies-Tech, I would love to offer my services of making your miner more efficient and effective in the home, office and server environments. You can send 1 or 2 or 3 units to my offices (no more than 3 at a time please) and I can go through each one and make changes to the case, fans, and power supply (just to name a few). Once done, I can ship them back to you for your inspection and implementation. Along with the new revised hardware and list of materials used, there will be a full write-up on what was done and why. And more importantly quantified data. Cost benefit analysis for each unit will also be noted. From there, you can revise your final product accordingly. All it will cost you is one-way shipping.
 
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