It's entirely possible for you to be leaking at the oil filter itself. Check to see if the old rubber gasket stuck to the housing, and you doubled it up when you put on the new gasket. I've also gotten the right filter before but the gasket actually was wrong.

I'd be willing to bet though that your sender is leaking at the threads. There is quite a bit of pressure right at the sender connection. Did you put any thread sealant (copper)on the sender when you installed it?

I know that some folks say if the CCV is clogged it'll force oil out everywhere. I just can't see that happening. It may cause you to have excessive blowby but it would take the path of least resistance, which would present itself at the valve cover and not a good tight connection like the pan, the RMS or the Oil filter adapter (considering they are all in good shape).