"I don't know one, but maybe there's an active newsgroup that
specializes in this sort of thing. "

Try in sci.electronics.design , at least they know what capacitance is. these people seem to think you are losing the signal resistively through the wire which is not true. What must be happening is thatt he conductors are too close together effectively forming a capacitor.

Run it by SED, they're just as cocky, but got more reason apparently.