I don't know about different stropping for different razors - there may be subtle variations and I've never observed that closely to know. What I do know is that I run into all sorts of bother with my Heljes because of the thumb notch on the underside of the shank. I've got long fingernails on my right hand for playing the guitar, and my thumb nail gets in the way when I strop razors with thumb notches. So I definitely modify my flipping action with these razors.

James.