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I think you have a pre-cat leak from your new downpipe installation. This is likely the cause of all your codes. Air is getting in and the O2 sensor is reading lean. Have you checked fuel trims to see if the car is enrichening to compensate?
As for your oiling problems, I would revert to stock to see if they go away. Somewhere in your (multiple) catch-can install there may be a check valve missing or in backwards, or you may have the in/out ports on the cans mixed up. Your current installation is causing problems worse than those you are trying to fix by having the cans in the first place.
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