Stir together 2 tablespoons lemon juice, yogurt, and next 4 ingredients in a medium bowl until blended. Stir in chicken and next 4 ingredients. Cover and chill 1 hour.
Peel and thinly slice avocados. Spoon salad over lettuce leaves. Toss avocado slices in remaining 1 tablespoon lemon juice, and arrange slices around chicken salad.
Note: For testing purposes only, we used Tabasco Pepper Sauce for hot sauce.