>Full grown you are looking at about 20 lbs of fruit yearly.

Just from the poorly cared peach trees that grow around my house it has to be much more than 20 lbs of fruit yearly. That's only like 100 peaches. I've been to a pick your own peaches orchard and it was easy to fill a 5 gallon bucket from a single part of a tree. I know there are a lot of varieties but it has to be a lot more than 20lbs.