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jhandy.... you say you put in 3 gallons of coolant and 1.5 gallons of water in your system - thats 66% coolant which is far too high a percentage.
Water is a far better heat dispersant than coolant so your ratio should be 50/50 max. If you live in a warm climate where there is no fear of freezing, then a 60% water / 40% coolant will also work well.
I'm changing out my coolant next service (9 years & 67,000km old original fluid) and while its empty I will also change out the pump. You only need a pump working at (say) 80% efficiency & there will be overheating no matter what type of driving you do.
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