If it ain't broke I definitely wouldn't fix it. But for those that can't get off the line (this should not be adjusted unless the car has a problem off the line. Plenty of reasons for lack of power elsewhere. Off the line there is no boost and lack of fuel delivery is less of an effect here.
There is danger to making the adjustment as occasionally something comes apart inside and the car will then go nowhere.
Peel back the metal shield in small sections till you can remove the plastic insert. Break the pieces from under the locknut before you loosen it.
And after all that, be advised that this is not considered a service shop job. It is only supposed to be adjusted on a pump calibration bench.
Bosch Master, ASE Master, L1
33 years MB technician