Chez Monsieur has a much different clientele and vibe for dinner than lunch. As do lots of restos in Paris. And wow, admire your stamina. After just one heavy trad lunch, i usually vow to never eat again. Somehow I can handle it better for dinner. Did you ever get food fatigue ?
I rarely order chicken at a restaurant but the poulet au vin jaune at Auberge Bressane is an exception.