I had 06 seths (same dimensions, minus the rocker) and had them at core centre +7cm from midsole but didnt like the tip dive. remounted em at around+4.5cm and really liked em there. Good for all mountain, limited switch riding. I think centre is around +11cm from mid-sole (true centre and core centre are different). So -3cm from true centre would be ahead of core centre, too far forward IMO for backcoutry/all mountain.