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Hello,
I think that the tire itself has a lot to do with good wet traction and less hydroplaning. I've had tires that hydroplaned badly at 45mph in just a little water, and others that work great at faster speeds and/or in much deeper water. Wide channels that are well shaped to let the water escape, and the right structure in the tread and sidewall also affect it, I'll bet.
Different tires can be wildly different in the rain; no matter what their internal pressure is. So, just because person has no issues with high pressures, doesn't mean that we all will be okay.
Not all rain storms are the same: from motorcycling, I learned to be very wary in the afternoon cloudburst after a hot day -- the water lifts all sorts of oil out of the pavement, and the surface is close to ice.
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