pressure plate experts

Just a coupla points. The tin cover is what stops the levers from moving back, but some rearward movement is nec to allow for disc wear. There is a weight welded to the outer ends of the lever, (see pic page 1), these weights take over to supplement the spring pressure using centrifugal force to add clamping pressure to the disc, that's prob why levers move with increased RPM after release. I used to make B&B clutches from the ones I broke. Notice the number of, and different color springs, diff apps different number of springs and colors. Your problem imho, its not assembled properly,. My $.02. cheers.