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Do you have a thermostat in the motor?
If you do not its possible the coolant is moving too quickly through the radiator at higher engine revs and the coolant is not sitting in the radiator long enough to transfer heat and cool.
I noticed when driving down to south FL my car would start to get hotter, not really overheat, then I would clutch in and put the car in neutral, coast for 30-40 seconds and put it back in 5th and the coolant temps would drop a few degrees then start to climb back up slowly over time, as the coolant was pushing through the rad too fast I am guessing.
I have the Koyo Aluminum rad, C&R surge tank, and a stock thermostat drillled out to provide constant coolant flow to the surge.
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