When the oil filter is covered in oil, there are only a few things it could be. Since you have a loss of power, I would start by looking at the valve cover gasket on the front to see if it has a massive leak somewhere. If not, then you can look at the oil filter to see if it's still hand tight. If that's not the issue either, then it could be the oil pressure sending unit (opsu) which looks like a spark plug with a wire sticking out of it and is located above the oil filter housing. Sometimes it develops a leak and you should be able to spot it with a mirror fished down between the rad and the motor.
If that's not it, then the oil filter cooler (the hose you said is wet actually has coolant in it and leads to the oil filter cooler) has an o-ring between it and the motor. There's a 30mm nut visible when the oil filter is removed that will allow access to this o-ring. There is a shield around the oil filter cooler that has to be removed before you can fully remove the cooler, but on mine it was so rusted that I didn't even attempt to remove the two bolts, I used a grinder to cut a slit in the shield and removed the cooler that way.
When the cooler is off, look even higher because the cooler was actually attached to a separate piece that bolts to the block, and that piece is held to the block with 3 bolts and has a hard gasket between it and the block, and that's where mine was leaking from. The gasket is cheap from the dealer, but is a b!tch to scrape off without marring the gasket surface.
Here's a thread on probetalk with a link to a pic showing all the parts:
Oil filter cooler gasket? Help plz - ProbeTalk.com Forums