The washer thing is not a good idea, IMO. Putting washers in is essentially the same as using a thinner clutch disc, reducing the pressure on the disk. Surfacing a flywheel does nothing to change the relationship of the pressure plate and the disc, other than moving the entire assembly forward. Like Jerry said 0.060" taken off the flywheel would be way more than needed, and even if they did take that much off, all it would do is add 1/16" to the distance the throwout bearing would have to move before it contacted the fingers on the pressure plate. That amount should be easily taken up by linkage adjustment.
As I've said before, RECHECK THE LINKAGE ADJUSTMENT.
