Cooling it
Sounds like you're about ready for an electric fan set-up here, since the bigger radiator didn't do it, which is a bit puzzling if it's a bigger 3-row radiator. I assume your fan shroud is in place and you have no leaks or loss of pressure from a bad cap.
You could try a new water pump first, just to be certain. If you do go that route get a new (not a rebuilt) pump and see what happens. If it doesn't do it, think about an electric fan.
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