skiwi wrote an answer about Marker Duke Ski Binding on March 21, 2009
I to have the same problem (not toe release), same bindings and same boots. With the front plate wide open (to prove the point) and with a big gap the toe will still not release (DIN=8). IMHO... The binding design drives the whole boot forward when you clip in, with such force that the boot tip is driven into the binding toe. The friction between the boot tip and binding toe stops it releasing. My binding toe wings barely touch the boot toe. I plan to shave the front of my boots so the wings hold the boot in and not the boot tip. take a close look at yours. Any feedback?