Oh yeah TomcatViP, got it now, and thanks for the info, makes sense!
Regarding the auto mode as we talk about it - it would be worth testing if the revs increase above 5500m automatically:
''The devices for the automatic regulations of the revs
hitherto used will be modified by Messerschmitt and VDM as quickly as
possible so that the short period increase in revs to 2600 for the
DB 601 A and 2800 for the DB 601 N permissable above the full pressure
height can also be made by the automatic device.''
The maximum permitted RPM for DB 601A-1 was 2400, which could be exceeded for short period of time above 5500m - up to 2600RPM.