Certainly from first hand experience on my truck, higher PSI makes for a harsher ride. It can be countered by the load.
That is - 60 PSI in my truck's rear tires with an empty bed makes the truck downright dangerous on rough roads. The truck tends to bounce all over the place. Lower the pressure in the tires and the vehicle becomes much more compliant.
Loading up the truck has a similar effect, making the 'spring' flex more.
There are certainly others who can comment on their experience with tire pressure in the 16" E rates tires. At 80 PSI they are going to be pretty stiff. I would be tempted to back that off a little as you suggest.
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