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Porsche has used both +/-4 and +/-6 degrees, with the latter being the most common on the M96/97.
Yes, you are definitely out of spec; cause could be a number of issues ranging from the tensioners, chain paddles (including the ones between the cams of a five chain motor), chains themselves, and/or the VarioCam components. Unfortunately, the only way to know what is causing it is some extensive diagnostics checks, which could include checking the actual mechanical cam timing itself, which requires some specialty tools...........
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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