fret wire crown height and width

It seems like most dulcimer builders choose medium crown height and crown width fret wire.  Doing some research I see considerable variation available in both crown height and width.  I've also heard that some people find it easier to play if "jumbo" fret wire is used.  I'm curious to hear opinions from this group about which size fret wire you choose and why.  I'm trying to build a dulcimer for myself that will be easier for my arthritic old hands and fingers to play.  It seems like VSL and the fret wire dimensions are the two primary variables one can use to adjust playability.  Your thoughts and comments are appreciated.