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I agree the oil leak is most likely due to increased crankcase pressure. Since you are not running forced induction, the most likely cause is inadequate venting on the oil separator side (right) of the pcv, or blocked suction lines on the side with the pcv valve (left). If the right side is clogged or kinked anywhere, it can impact the pcv system in both the vacuum and non-vacuum states. In the vacuum state, the right side tubing lets air in to the crankcase. At low (or no) vacuum, it lets excess pressure out of the crankcase and it gets pushed into the intake tube between the MAF and the throttle body.
You do not want to put a cone filter in the middle position of the oil separator. The inside will eventually get coated with oily residue clogging up the filter.
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