Re: Anything else I can do?
Your milk did not come in, most likely, because you had a retained placenta. Have you been checked out to make sure this is not still an issue? Just because some came out on its own, does not mean it all came out.
By the time your placenta came out (assuming it has all come out) you were already supplementing, so your milk production did not get the stimulation t needed to rebound from that poor start.
It is probably possible to increase milk production, and since you have a good guess as to WHY your production is not normal, that can help you pinpoint how to approach it.
First, I will suggest what you need not do. You do not want to be dehydrated of course, but over hydration does not increase milk production. A balanced, healthy diet is always helpful to you, but basically as long as you eat when you are hungry and drink (preferably water) when you are thirsty, that is all you need to worry about nutrition-wise for milk production.
What you can do: To make milk, the most important component is a normal postpartum hormonal balance (why the retained placenta messed you up) and frequent, effective removal of milk from the breasts. Galactagogues (oatmeal, fenugreek, etc.) are only going to be a POSSIBLE help if you get those two things working for you.
Also, Consider why baby is not nursing more effectively: if there is milk, is baby bothering to really try to get it? 3.5 ounces per feeding is not a supplemental feeding. It is a complete feeding. If your baby is getting 3.5 ounces 8 times a day, that is 28 ounces per day-normal total daily intake for a baby or, close to it. A baby who is being fully fed on formula is NOT going to be hungry enough to nurse with normal frequency or effectiveness. Do you have the sense baby is able to extract any milk when you nurse? For example, are there sounds of swallowing?
That pump output is very bad. But why? Often even a very good pump works poorly if it does not fit well, and some moms just have a more difficult time pumping. Do you get milk expressed when you hand express?
Without delay, schedule an ultrasound or whatever test is needed to make sure you are not still retaining any placenta.
If baby is able to latch and nurse, consider an at the breast supplementer (lactation aid) for supplements. Please let me know if you would like more information about these.
If you prefer to stick with bottles, I suggst, give bottles like this to avoid over-supplementing: http://www.llli.org/docs/00000000000...astfedbaby.pdf
Get the book "Making More Milk" for accurate information about proven strategies for increasing milk production.
Consider a prescription galactagogue
If you have not already, see an IBCLC- A board certified lactation consultant who is experienced with issues of severe low production.
Re: Anything else I can do?