Can anyone diagnose this overheating problem

[Barnsnake]

Why put the thermal switch for the fan in exit side of the radiator? The temperature of the radiator is of secondary importance. It's the temperature of the engine that matters.
By the time the temperature on the "cold" side of the radiator reaches the trigger point, the water coming from the engine would be critically hot (assuming the radiator is working).
There's generally an extra tapped hole in the intake water passage near the thermostat. Put the fan trigger switch there. If you are using one of those between-the-fins radiator temp switches, put it as close to the incoming water as possible.

[rtstrack]

I have a new symptom to add to the mix that may possibly be pointing to my pulley ratios. I went out for a ride tonight and noticed something very interesting. At 2900 rpms or more, the gauge was reading 200...anything under that....say 2000 or so and the gauge quickly shot up to 230....get onto an open patch of road and get the rpms back up and the temp dropped. Does this mean that I need smaller water pump pulley?