You need to determine what your noise is, have a listen to some examples on youtube. The options discussed previously would seem to be the best fit for your symptoms, but without actually hearing it, it's not easy to say with any confidence.
If you are sure it is pinking, it might be worth getting a live data diagnostic done while the engine is cold, to see what exactly is going on.
Just to add, if it is pinking, it should be noticeably worse on 95 RON unleaded.