Daniel - I was worried when I read your post with the fear that you had a tiny bit of combustion pressurizing your cooling system as this has happened to me before and its the worst feeling having to go through the effort of pulling the motor, redecking the head and or block and new a headgasket etc etc.
Anyway and luckily it seems this is not your problem.
Pallnet's suggestions should be seriously considered. You have seen my white ZX Turbo. I am running a very thick intercooler and a thick oil cooler and also twin electric Flex-A-Lite fans thermostatically controlled on a semi-custom aluminum Arizona Z Car radiator. I also removed my AC condensor.
My car never sees past 180-190F it runs beautifully cool (I have about 80-90 miles on my new set-up, maybe more), in fact the electric fans earn their keep though and run frequently. Its comforting to hear them kick on as the L6 is not tolerant of high temps or temp spikes. I lost my faith in the clutch fan many years ago.
I hope that helps, contact me if you want to chat further as we are only 45minutes from each other.
I ecstatic you got your car up and running and I hope you guys had a great time yesterday at Tynan's (any pics?). Sorry I was a no show.
My best,
Yasin