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OK, I wasn't too clear: I meant wet roads rather than enough water to cause hydroplaning. In fact the possibility of hydroplaning didn't even occur to me when I wrote my post yesterday.
If you can discount aquaplaning it is surprising how much traction you can gain by dropping pressures when grip is low. In extreme conditions, such as on ice or grass, dropping the pressures very low can get you moving when you are otherwise stuck. In "normal" wet conditions a slight drop in pressures will usually improve things. I can't comment on why that is so.
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