Tire pressure

I am going to Conti GP 5000 32mm clincher tires. I weight 170 pounds and the bike and the stuff lets just say 25  pounds. Standard Shimano disk rims  RS171 is the wheels. According to the various on line calculators they suggest I use a tire pressure of 62 rear and 60 front. A few put them up to 68psi in the rear.
To me this is drastically lower than what I am using on the 28's. I might have the 28's drop to around 75 front and 80 rear before I reinflate but I am surprised. Maybe I am just way off the mark and putting in to high psi. What would you experts say. Naturally the 32's are going to be less but maybe now even on the 28's I am running to much. I usually get the rear up to around 90 and front 80 and then let them ride lower for maybe a week or so depends. But 62 is way down the line.
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Deacon Mark