Ok, it's working... The timing to press the buttons is a little bit more sensitive on the tablet than on my phone (EVO 4G LTE). I think I was just pressing the volume button a little too out of sync from the power button. Anyway. n00b mistake on my part.
I have a really basic, stupid question about this ROM... How do you take a screenshot? I've tried power + volume down numerous times, but it's not working. Was this functionality removed from this ROM?