TX Power with PTP820 ACM

With the PTP820S, for a given band the maximum TX power for a single modulation seems to increase as modulation mode decreases (ie, max TX power is higher for QPSK than it is for 1024QAM).  When configuring the system for ACM using modulations 1024QAM down to QPSK, is the same TX power used for all modulations, or can the TX power increase as the modulation decreases?

when ACM is enabled, the Tx power is limited by the highest modulation mode on PTP820.