If the tires had less than 50 miles on them when you encountered the rain, then I vote for mold release.
Mold release is sprayed on tire treads at the factory. It is a slippery liquid that makes it easier to get the tire out of the mold. It is usually left on the tire and it is really only practical to get it off by putting some mileage on the tire. This is why you hear racers talking about "scrubbing in" race tires.
Mold release (or ArmorAll on the tread) will definitely effect the wet handling of the car. Also, had this been the first rain in your area in a while? If so then there might have been a healthy film of oil on the road as someone else suggested.
I say don't worry about this one incident. You did the right thing by slowing down until you felt safe.
But I do think you should have the wheel bearing looked at by someone knowledgeable (in general I am not impressed by tire shops). Try to find yourself a GOOD Porsche mechanic in the area. Contact your local PCA and ask around. A GOOD mechanic is worth far more than his hourly rate and a mediocre mechanic is worth far less no matter how little he charges. Also dealerships vary in the quality of their service departments. Ask local Porsche drivers which one is best.
Regards,
Alan
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