For the best texture, use just ripe avocados that yield slightly to gentle pressure without feeling mushy. Cook the bacon fully until crisp so it stays crunchy when mixed into the creamy filling. To prep ahead, store the egg whites and the avocado yolk mixture separately in the refrigerator, pressing plastic wrap directly onto the surface of the filling to limit browning, and assemble within 3 days for optimal color and flavor. Serve the deviled eggs chilled and avoid reheating, as warming can dull the flavor and change the texture of the avocado.