I would put the brakes on here, just a little.
I think that it is more probable that your compression gauge is inaccurate than all cylinders have an abnormally high compression pressure.
If your compression pressure was really too high, then the engine ECU would be throwing knock and super-knock fault codes all the time.
I am not aware that these engines have any history of carbon build-up in the cylinders themselves, just in the inlet ports, which is a different set of symptoms.
I think that all of the symptoms that you initially listed could be caused by a failed PCV valve, or perhaps by bad turbo seals allowing an abnormal quantity of oil into the engine.