Saw the vid. I have to say that your grip seems to work for you but I would never recommend others to try that and I hope this is not a promotion of it. I see no benefit in wielding a razor over the face in that fashion when standard grips achieve all that is required.
This points to and uncomfortable learning phase when you started out IMO. I see no need for it to benefit camera perspective either. I am sure your style will progress as I'm sure others and mine did.
PuFF
p.s. Steep angle too at times too I noticed.