I was able to do a little digging and I came up with the answer to my own question. For anyone interested, the sysex string that requests a dump of global data from the SGproX is:
F0 42 30 4A 0E 00 F7
to request a dump of Programs:
F0 42 30 4A 1C 00 F7
to request a dump of Performances:
F0 42 30 4A 1D 00 F7
to request a dump of All Data, simply string the 3 previous messages together