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Bloo, one more suggestion :-)
I've seen this happen when the water pump impellor "slips".
There is a lot less slip at low RPM's. As the RPM's increase there is more slip cause the impellor not to keep up the water flow.
Simple things:
Check to make sure the "key" to the water impellor / shaft was installed.
Check to make sure the impellor has been "spun" off the shaft. The rubber portion tore loose from the shaft portion.
Just 2 more on the list :-)
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