I had a similar problem with oil residue on the front passenger side of the engine and a streak on the underside of the hood. It turned out to be an oil leak between the head and the timing cover. If I carefully cleaned the timing cover/head area(up under the front of the head at the top of the timing cover) it would stop the oil spray until enough oil leaked out again and the oil started blowing around like in your pics. Later a headgasket replacement was done and the problem went away.

It might be worth looking at this as a possible source for the leak.