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To refocus back on the original topic, braking alone does not comprise all of the aspects of wet traction. Theoretically, a larger contact patch would always lead to better braking and traction; however, in wet conditions, that might not always be the case. The biggest factor in wet traction is water evacuation, which is dictated by the tread pattern.
Think of it this way (and without taking into account tire pressure), a track slick has a massive contact patch in comparison to an all-season tire, but which tire actually performs better in rainy, wet conditions?
I don't necessarily want to take sides on this, since I don't have any empirical evidence either way. Over inflating might or might not improve wet traction (imo, it would have a minimal effect at best); however, under inflating is definitely the wrong thing to do (unless you're off-roading/rock crawling).
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