You are adding another variable with the OS jaw
As for the toe catch (effect is the same for front or rear foot), you would have set the trap to deep, or postitioned wrong. Have had sprung traps (toes, water current from the swimming foot etc.? Not sure the cause...) that by adjusting depth/posistion have produced favorable results.
As for more reliable- more mass in the hind foot if one makes a catch as intended- pad, or just a little above.
I don't know about you, but I'd rather maintain or increase my odds of "one in the bag"!