We are new to editing HD. Have ingested some XDCAM EX footage into FCP but am unable to play out in realtime via Kona LHe via SDI through a AJA HI5 converter to HDMI monitor. Will pass through 1080i video straight through from an HDV tape deck fine but not from a hard drive. We have a LaCie Biggest S2S in standard RAID 0 configuration plus the usual internal drives bays occupied. What are we doing wrong?