L L.
I'm not an expert on fish. Can't help much there. But, I do believe your estimate of 1/4 acre pond size is inaccurate. After seeing your pics of the pond, i would say it is closer to a tenth than a 1/4.
With that said, would any of the experts like to take a stab at stocking rates for a tenth acre pond? #'s stocked seem a little high to me,but with aeration and pellet feeding might work?
Could the bread being fed, if in too large of an amount, cause water quality issue that could lead to a kill?

I'll start treating my wife as good as my dog when she starts retrieving ducks.
http://geocities.com/h20fwlkillr/