I made a mistake the radiator is 2 row 1inch core. Im pretty sure but cant remember but the cooling fans are not that high of cfm. I have not used a high flow thermostat but the water seems to be flowing well at 180.
Then you might can rule out the radiator. Have you tried DRIVING it down the road to see if the extra air flow might cool it down? 205 isn't over heating, but it's hotter than I like to run them.