I'm about to get a 2005 without KDSS. I test drove 2 470's at the dealership and was looking for the thump. Neither one had one that I could reproduce. Neither had the steering wheel vibration either. Then again, these issues may manifest further down the road.
What was the build date on your 470?
Is the notorius thump similar to the thump you feel when you accelerate from a dead stop in neutral and with the RPM relatively high, you shift into drive? Does this accurately describe the thump?