Radiator shroud...

nitronut said
I'm moving the car runs between 185-190 degrees.

your thermostat is working great!

nitronut said
As soon as I'm stopped in traffic not moving for a couple minutes it jumps to 205-210 degrees but then shoots quickly back down to 185 when moving again.

That sounds normal to me. If you idle for longer does the temp continue to rise of does it level out in the low 200s?