Ed, the car's just not designed for bad roads and gridlock traffic. There's not much you can do to improve the ride to make it really comfortable.
I've been to HK many, many times (both the island and the Kowloon side) and while there I saw a number of high-end exotics (Porsches, Ferraris, Maseratis, etc.) and wondered why on earth they'd be using those cars as daily drivers!
Buy a Lexus as your DD and leave the Porsche in the garage for very early morning drives in the twisties I found in your part of the world
