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no need to use either with xtrrom or xtrsense. you just use the gscript app. the instructions are in zach's original post for the roms. just the latest versions aren't oc'd by default. previous versions are.
Actually according to his threads over at XDA, the default ROM configuration is still overclocked to 710400 for both xtrROM and xtrSENSE. He includes numerous GScripts to modify the overclocking without downloading SetCPU.