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The DB605A used by the 109G-1 to G-8 had a maximum rated power output of 1475PS at 1.42ata, 1310PS at 1.3ata. The 1540PS (actually 1550) you put up are actually for the higher altitude rated DB605D which was a very rare sight on early mark Gustavs and only a stop gap in the development leading up to the later MW50 powered high altitude marks such as the DB, DC, DM, ASB, ASC, ASM,...

DB 605A

1475PS at 1.42ata - 0 km
1550PS at 1.42ata - 2.1 km