Joined: Jan 2010
Posts: 9,815
Likes: 1,790
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
To my eye, the OP did an accurate enough carving job such that I really doubt that the pad could be coaxed backward.
Hopefully duplicated on the other side!
One more thing that I think should help would be some directional beveling of the retaining stud, allowing easier "forward" pad motion while resisting movement rearward(?)
The Modolos all seem to respond very well to some degree of spring relaxation, reducing needed lever pull force.
I've done this on many calipers, so can brake quite safely from the hoods with good pads.