I would go out and try some nice, revealing cables. They do not have to be silver as they could be gold, copper, amorphous metal but aim for small conductors and good connectors. No fancy RF! canceling geometry as a straight wire works best.
This mirrors my findings completely. Putting a He90 in a SR-007 matched system will only end badly and vice versa. The He60 comes closer to bridge the gap along with the SR-Omega.