strange unplugging the maf seems to have made the overboost worse lower down in the rev range.
I think you may be at the point of professional specialist/garage advice , you have plenty of data they can be fed for where to go next
how far from specialists like autolusso ahm are you?
if nothing else they will have more equipment to quickly check out your systems like hand vac pump and gauge to visually confirm the turbo actuator starts to pull at the right vac and finishes at the stop pin at full vac, then check your boost solenoid is delivering right vac amount at full spool and no vac at min spool.
they will have much more experience on what things out of tolerance cause issue and what things don't.
could be worth trying the loosening off of those actuator bracket bolts (3 I think)and pushing the assembly towards the arm (then retighten as holding against pressure)to make sure you've got all available travel now ?(as in one of my vids-maybe gain 1mm or so a few % vnt)
then free but not advised, if still occurring you could try adjusting vnt actuator rod length(not advised, your adjusting one thing to be correcting for something else most likely)
id always go cheapest thing first, and with those injector cor values I would say one good quality strong injector cleaner in a tank or 2 cheaper bottles (petrol station jobbies)
and drive it for a tank, repeat last few logs and see if improvement on values.
if nothing else this will prevent contamination of any future work on injectors if it goes that direction, as it should clean the tank, pump,hp pump, rail etc.
just avoid full throttle for the tank, as this sort of overboost will be shortening your turbo life to some degree(2400mbar to 2500mbar not end of world but 2600-2700mbar you don't want)
next cheapest is probably boost solenoid valve as mentioned in the post above, although it appears to be working ok.
after that if you shop around and can do a bit of the work yourself, getting the injectors off and checked could work out cheapish, I say could do as to test may only be £15-20 an injector but if it comes back a duffer it could cost many times more than that to sort it out/refurb.(but again see lots of threads on stuck in head injectors and leaking /fracturing hydraulic pipes and non sealing ends just so you don't dive in)
and if you go that way don't forget new copper seals every time you refit injectors.