jpracing, I know exactly how the road are in the Philippines I grew up in Metro Manila and I have my fair share of bent or cracked wheels on my Honda.
The truth is you may never get your 200 to ride like a Rolls Royce. The 200 is design to be a tough off road vehicle. Therefore, the suspension components are heavy duty which makes for a high unsprung weight. The unsprung weight has a direct affect on the ride quality and feel of the vehicle.
From my experience tuning and designing vehicle suspension, there is no single shock setting that will work for all conditions. If you tune your shocks it to soak up low speed bumps or pot holes it will be too soft for high speed conditions and vise versa.
I believe Toyota did what it could when selecting the shock valving on the 200 to give it a good balance between low speed comfort and high speed performance and stability.
If you want a softer riding 200. Many of my friends in the Philippines are switching out their rear coil springs for the US market ones. It lowers the rear so you don't have the stink bug look plus it is softer hence a better ride. I would probably think the shocks in the US might be tuned differently then the ones there.
For the tires you can try Michelin and lowering the PSI to 25psi or lower. This is bad for handling and tire wear but might give the ride you are looking for.
As far as shock manufacturers goes. I love KONI and I have worked with them in many occasions. They have a shock called the FSD that might interest you but they are only made for passenger cars. Here is the link
Koni: FSD
Lastly, take a ride in an ordinary SUV and recalibrate your senses. You'll notice a night and day difference when you get back to your LC200 that you'll forget about this thread.
Good Luck and keep us posted!