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Well Folks I happened to figure out the solution, via a partial response from Siemens that I received. It seems that my issue is that there are a limited number of "subsystem-based monitoring models" that you can add to a simulation. I am not entirely sure if this is the same thing as subsystem-based monitoring channels, but I assume this is the case. Anyway, the response from Siemens stated: "that given a 150,000 bus initialization, the maximum number of subsystem-based monitoring models allowed is 2000."

The work around for me then, to get all the bus voltages, angles, and frequencies, was to add "non-subsystem based channels" to the dynamics file (.snp file). The pseudo-python code below does just that:

busnum = 1
while busnum < #ofBusesInSystem:
    psspy.voltage_and_angle_channel([-1,-1,-1,busnum], '')
    psspy.bus_frequency_channel([-1,busnum], '')
    busnum+=1

These can be found in the PSS/e API manual chapter 4.2. Hope this is helpful to someone... I wish rules like that 2000 subystem-based channel limit were more readily available to users... I guess that's why Siemens makes the big bucks with their support services.