Actually, the angle for the hands is not the same on the moustache bars as on the North Road bars. I have moustache bars on my LHT and my hands are nearly parallel to the frame, whereas the grips on the NR bars have an angle sweep for a more natural hand position.
When you said the bars were too close to the seat for you on the Mixte -- do you prefer to be more stretched out? I do not want to be stretched out on the LHT (my all-around bike including commuting); therefore, I might prefer a shorter cockpit than your preference.
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Specialized Roubaix Expert
Surly Long Haul Trucker