I'm also a large guy: 6'4", 290# with large hands, and I found the EBMM JP that I've owned for about 1-1/2 months to be the best neck shape for all but one style I play. Most of my original music is Progressive Metal - in the style of Dream Theater/Malmsteen/Rhoads, etc. - lots of stretches and quick runs, which the JP excels at.
But when I play Jazz chords using all four fingers all crunched together, I miss the C shape of my F*nd*r. With chords like that, there's a gap between my thumb/palm and the back of the thin JP neck. That gap used to be filled by the C shape neck. I guess some of the other EBMM models have a more traditional C shape. So I'm having to alter my positions to make playing Jazz more comfortable on the JP. For Rock/Metal/Neo-Classical stuff though, the JP neck is the best and fastest (least limiting) I've ever played.
Anm ironic side note: Since I bought the JP, a guitar clearly designed for hard rock/metal, I find myself fingerpicking through the Piezo more than anything - It sounds amazing.