Well, if there is a weak spot on the radiator thats perhaps seeing heavy corrosion behind the fins, adding the high flow pump might bring it to your attention with a quickness.
Try running a bottle of Radiator flush thru it first and check out Water wetter or a similar product. last I checked, Water wetter was running for about $20+ a bottle, but there are other brands for cheaper (but somewhat less effective)
Is the radiator shroud in place? If not, this could also cause an increase in average operating temp's.
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