Re: make more milk
That's great you are able to nurse him at lunchtime! But I really think that if he's taking 16 ounces in addition to you nursing him at lunchtime you need to talk with the care providers about how much he is being fed.
Are the bottles they are giving large? Babies tend to drink from a bottle until it's empty because it's a constant flow, unlike nursing fromt he breast where the flow comes and goes. Sometimes if you break up the bottles into smaller increments, like 2-3 ounces with a couple of 1-2 ounce top-off bottles, it gives the baby a natural break where they have time to stop and breathe, maybe burp and decide whether they are really still hungry.
You might also want to make sure you are using slow-flow nipples, which will make feedings take longer, satisfying the urge to suck. If your nipples have been used and washed many times they may not be slow-flow anymore (even if they started that way). You can check them by filling them with water. The water should drip once per second if they are slow-flow.
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