I have the silvers on all 4's of losi long wear aluminums but my clutch still "slides". Is the spring not stiff enough or could it be the shoes that I'm using?
IMO the springs are the problem, they are too stiff, try four gold springs. You might even want to step down to a lighter spring then the gold. You will lose some of the snap, but on a loose track, the truck will not be upset as much when you stab the throttle.