You might try moving the 8300 to Video2 and using the Video1 record output instead of the monitor output - with DVI selected, it may not be worrying about feeding the other inputs to the monitor outputs, but the record outputs would still get a signal (the move to Video2 is based on the idea that having Video1 inputs go back out the Video1 record output might not be done simply because it would be a bit recursive, so to speak).

Another thought - try the zone2 output?