i just wonder if something may have happened to the pushrod itself ,,,, maybe even something to do with the p ocket or whatever its called on the right side . i know throwout bearing, etc. maybe you should take a look at the ball ramp and the pushrod lenght. just an idea. i am a bit more to working on older clutch stuff
ck. condition of the pushrod ,, lenghth etc. if o.k. pull side cover and ck pushrod pocket on that side of things , sounds to me something is or has abnormal wear maybe pull adj. screw all the way out and measure it for proper lenght. then again if youve been slipping the disc for that long they may just be worn. strange very strange.