Haven't you already started a thread?
Anyway, this time you mentioned bov, which I assume is an atmosphere one. Other thread you mentioned 'lumpy cam idle' which can be caused by the bov being partly open at idle and drawing in unmetered air.
Regardless, put stock bov back on.
Your oil everywhere could be due to turbo seals, or excessive blowby due to piston ring wear. If the oil is in the inlet to the turbo it is blowby, if only in the turbo outlet it's the turbo seal.
Valve stem seals don't get oil into the inlet pipework.
You could try adding a catch can, but I wouldn't expect a miracle.