I have the same bike as you (well... mine isn't a WSD and it is a 2009, so I don't know if it's exactly the same), and when I first started riding it after riding a mountain bike, I was having issues with tingling/numbness in the girly parts.

When I bought the bike, I had my sitbones measured to make sure I had the right size saddle, which it was. After a few rides, the discomfort pretty much stopped. I only have issues now if it's a longer ride on flat rough roads.

Give it a few more rides and perhaps try new shorts.

Just an odd note on the PI shorts... I have two pair that are different years of the "same" style short. The pad is different in both of them. I actually like the older ones better chamois wise, but the new ones fit better.