Re: One let down per feeding - normal?
Good diapers + good weight gain = no worries!
IIRC, you had some degree of oversupply when you started out...? If so, it may be that your body is adjusting to produce the right amount of milk. Often when that adjustment takes place, moms notice a decrease in things like letdown sensation, engorgement or fullness, leaking, etc.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"