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Pual:

I see you point about non-uniform tabulation.  I was thinking about it from the perspective of a lookup table like I would use in Excel which is what I mostly use instead of a programing perspective, where yes it would be lot's harder.

The point of the graphs I was suggesting is to better determine when to use Sadler's technique or when to discard observations.  In Bayless there is a graph that indicates when to use Sadler but the narrative admits the criteria for deciding is a bit arbitrary.  I have been trying to think of ways to improve that graph.

You indicate that for 0.5^o tabulation, t<82^o and >98^o and dec less than 75o max error is 2.9'.  Should that read t or K?  82^o>K<98^o is what recieves the caution in Ageton, Pepperday and Bayless as I recall.