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we're navigating that now. center of rails? center of flanges? a particular flange width? a given distance shorter than 27cm? (i.e., a 24cm saddle uses our standard formulae + a fudge factor.) no good answer for you yet. working on it.
i printed a plastic gauge that is 80mm wide on the internal, that i put over the seat and measure from there.
so everything is measured, hight reach and setback from that point.
70mm and 90 mm didnt work on all seats so i came on 80mm .
it is close but not even perfect, you will have to make small adjustments
I use this as my reference point for saddle height, setback reach and drop. As it removes most of the possibilities due to saddle angle creating different measurements.