SRSLY, OP almost buried the gold. Glad you caught that!

OP, everyone is different and there is not a "single, correct way." Generally speaking a position that allows an activated core, a flatter back, and a chest up and out position is a fairly powerful setup. If your lower back is flatter and your core activated then if setup correctly your hips tend to roll forward and you can utilize legs muscles more efficiently. Really though, it totally depends on your physical makeup and the rest of your bike setup. Bottom line is to make sure you and your rump are pain/numbness free and can comfortably travel many miles. How you accomplish that often changes as you ride more/longer becoming stronger and more flexible.