Yeah it’s normal 😊 I get 10oz for my first two and then between 4-6oz for my remaining pumps! Why don’t you get a cool bag so you can take the milk with you?
Your milk is lowest in the evenings and highest 1-4am. Power pumping won't increase your milk in the evenings it'll just increase your overall production (for some people not all it's not guaranteed to work) You could also take some ready made formula bottles to top up if you need to.
Baby is still getting all he needs, thankfully. It just means we're bound to the fridge in the afternoon &evenings bc we continue to use the morning supply later in the day