Thanks! I'll get pictures of the other 3 corners, but it's been quite rainy and that was the only spot where I could get pics without getting soaking wet.The pics show that the original Nivomat (self-leveling) shocks were replaced. If you have any history on the maintenance, that might show if the springs were done at the same time; they should have been. Standard shocks and OE Premium Smooth Ride coils (softer ride) is not a good package, so the springs are suspect. You could try air bags in the coils with various psi settings to see if that would improve the stability, or update the shocks and springs.
Be sure to check the other items I wrote about the sway bars and jounce stops, too.
The Strutmasters link in your first post is not really what you need -- that's for air suspension and your SUV doesn't have that. A Bilstein package like @OR VietVet posted would be a good conversion from Premium Smooth Ride to standard suspension.
I appreciate the advice!