A bit of reserve cooling capacity is good to have. IMO you are on the right track.
If after confirming good water flow through the engine*, and a acid flush you are not happy with the result try removing the thermostat and balancing the water flow through\around with a valve on the bypass.
*Start at either end of the cooling system checking for any blockages. There may be a piece of crud in the inlet strainer restricting the water flow to a blockage at the end of the manifold or something in-between.
Even thought you have a new water pump it wouldn't hurt to check to be sure the impeller is in good shape.
ex TRUE GRIT
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