We did the same thing when we went to New York. We already had reservations for dinner at Le Bernardin but wanted to also try out Bouley without breaking the bank, so we booked a 5 course tasting during lunch. It was $55/person but well worth it. Service was still exceptional (a lot less tables for the waiters to work) and we ended up getting 8 courses because the test kitchen was trying a few new dishes haha
When you guys were in Paris, which was your one must have dinner spot? I'm all about the food whenever I travel but I'm having such a hard time deciding because there's so many damn restaurants to choose from