Agree with reclocking. The transmitter and receiver are your limitation, therefore avoid bandwidth limited optical and go USB, possibly coax. Coax is TEM00 and USB is twisted pair, at least it better be. But this is digital so the cable bandwidth is not that critical as analog, and if you mismatch cable impedance, which is never perfect, your error correction from cable reflections, unless your connection is under 6", should give you 100% of your signal. I get no errors in my hi res system.
