I think that adding lead couldn't hurt. The extra mass should make it more stable. I have thought about adding lead to my duplicator to make it more stable. As far as using laminate for both surfaces, I don't see that being an issue. Just keep them dry and don't wax them. I would't want them as slippery as ice, but I don't want the friction to be so great that it interferes with the control needed to make a smooth cut.
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