WTF,
I think the symptom as you describe it is not quite right, it should take lots of right pedal before you hit the stop while taxiing at flat pitch, probably more than half the pedal travel, almost to the end. If the right pedal is only 1" from neutral while the stop is contacted, I would think the rigging is slightly off (or the pedals are biased). Where are the pedals at normal cruise, 145 knots or so?
The mixer in the 76 is an interesting bit of kit, it makes the workload lower in normal flight (all Sikorskys since the S-58/H-34 have the mixing) but the lack of any boost servo means the pilot sees the mixing, producing some interesting combinations of control interactions at times. The designer is certainly not in the nuthouse, he is retired now, and his son is a fine engineer for Sikorsky, to boot.