You are approaching the whole problem donkey-backwards (or maybe the other word for donkey, which will get censored...)
There is , ideally, no such thing as a saddle top radius. You need to sand the bottom of the saddle dead flat, and then file the top of the saddle from the top, in situ, to get the desired action for each individual string
You then merge, by sanding, the flats so created to give you a smooth curve. This curve, however, is never a "radius".
To give the correct profile for the top of the saddle, the way to do it is to use the semicircular notches on a utility knife blade ... use these notches as a scraper, and you will have a lovely semicircular profile in no time.
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