There's a line of thought, promoted mostly by the makers of Tusq, that Tusq is better for an undersaddle pickup because it's more consistent in density. There's probably some truth to that in the grand scheme, meaning that you can probably find some examples of bone saddle blanks that have "light" spots in them, but bone blanks aren't cut randomly, and it's my guess that the proportion of bad ones is extremely small. I've cut several over the past 10 years and never came across a bad one.
As Tom noted, the trick is to get the bottom edge absolutely straight and true, but you need to do that without a UST as well.
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Chris
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