There is no black art involved in recurving.
Under that plate there are weights and springs. Re-curving is just changing the weights or springs or how much they travel.
Under my plate was two weights, and a light spring and a heavy spring.
I am turbo'd, so I wanted LESS centrifugal advance, soI could set more initial advance.
Taking off the smaller, lighter spring only worked out perfect for me. It allowed the weights to be moved up halfway already, even at idle. This gave me a lot better torque to leave the line, but still not be over advanced at high power.
very simple.
If I were you, I would set the timing at idle so it runs smooth, then move the distributor while running to retard the timing so you can just barely hear it start to run "not as smooth" - -- but long before it runs rough. That usually works best for me.