Re: frozen milk and fresh milk???
I'd suggest one bottle per day of frozen milk, just for a short period of time. Milk will keep a long time in a deep freeze so you don't need to rotate out too frequently.
You want to make sure the frozen milk is given as the first bottle of the day. Because previously frozen milk isn't good as long as fresh. Don't mix the two for the same reason.
That is great that you are able to pump so much!