i've been tinkering with clutching on my m7 for the past two years and played with lots of different combos including a torsional kit. what i have now is by far the best setup i've ran. right now i have cutler adjustables set about 66.5gr with some loaded in the tip and the rest in the heel, stock yellow/white pri. spring, stock 36 degree helix with black/orange speedwerx sec. spring(140/270)(compression style) and S/A. i ride at 6-9000 ft so it may be a bit off from what you may need, probably just different weights would be the ticket.
i ran the cat orange sec. spring(175/280) most of the season but i felt it was just to stiff. it felt like it was hindering upshift and costing trackspeed. also i think it was a major cause to clutch heat in my primary from having to fight the stiff spring. my sled is stock with rkt modified stock head and also geared down 2 sizes so that may have some effect and is one thing i'd also recomend if its in the budget. my sled is awesome on and off the throttle in the trees and still pulls the hills great.