I tried the modified pinch grips you posted and it didn't feel as secure. We don't want a very sharp knife falling.
Mark was kind enough to send me a photo comparing the three knives. What are the pros and cons of a taller knife?
According to Mark "The measurements for knuckle clearance are as follows: extra tall: 33.99mm; Artifex: 25.05mm; tojiro: 22.27mm". Blade profile also seems to change.