Okay, here is the post script on this topic for future reference. I swapped out the 20 inch rims and low profile tires for a more standard 15 inch rim with redline radials. It made quite a difference in ride quality, together with the new front end and KYB shocks. The 20 inch rims were way too big for the car, even with the low profile tires. I had rubbing issues on sharp turns and scraping when going over big dips/bumps in the road. I sure wish the car had come with a smaller wheel and I definitely agree with other posts indicating that 17 inch is probably as big as you'd want to go.
The car rides more like what I'd expect. Below are pictures of the new wheels.
