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Here is how you can use scal with Python to to an incremental scale instead of setting to a specific level.

psspy.scal(
         sid=1,         # only scale subsystem id 1
         status1=3,     # specify incremental power
         status3=5,     # incremental Q load
         scalval1=5,    # increment by 5 MW
         scalval7=5)    # increment by 5 MVAr

1.216 of the API manual has the full run down of options for scal