Just wanted to update to all that after 6 years and 21K on the 4th Gen 2010 TSB 10-3-8 setup my clutch is still awesome.
No slippage, smooth take-up and most importantly NO CHATTER! As far as I am concerned the switch to the 2010 organic materials and the better flywheel fixed what was the only real disappointing aspect to the experience of owning this car. I have a good friend that just purchased a used 2007 Gt500 with 10K on the clock and he messaged me today after taking delivery yesterday about clutch chatter. I referred him to this thread and we'll see if we can get him sorted too.
Special thanks to Grabber and all those that helped us all along the way with the final resolution on this issue. I plan on keeping this car for a very long time. Maybe it's even time for a few upgrades from stock to keep up with those new Mustang GT's and their newfangled coyote engines!