You gotta consider a 2Pac at 150MHz is going to be pulling about 1.4 amps. That's not insignificant.
so drop the freq and/or get a more powerful hub? suggestions on hub?
FYI, I feel like an idiot for not realizing that it had to do with power per port.
UPDATE: I dropped them to freq 25 and all 4 worked fine. Time for a new hub.