shkong78, it's obvious you are taking this very seriously, and you will get very serious results, the kind of results that do not come to casual audiophiles.
dgarretson, No surprise that the connectors make a big difference. It also makes perfect sense that the line-level EQ would be influenced dramatically by the Schroeder Method. To my ear there is not a tonal shift by moving to dual ICs, but instead a deepening, or intensifying of the tonal character, like a deeper shade of a color of paint. Absolutely it sounds far more real. Of course, the tonality would shift with every different pair of Schroeder Method ICs. I do that consistently in my rig.