EUB radius- what's yours?

I've read a bit on this, & keep seeing 72-75mm or roughly thereabouts as a common DB fingerboard radius. It does seem to me, though, that my DB's fingerboard has a compound radius- with a smaller radius at the nut end & larger at the end nearer the bridge. Am I hallucinating? EUB builders, what radius are you using, & why?

 

I'm trying a compound radius of 3" @ the nut/4" @ the end of the fingerboard. There- I answered myself.