I don't know the proper answer John but I can do the math. Quarter acre twice a day looks to be at a rate of about 8# of feed per acre per day.
I forget if you have aeration. Without aeration I definitely would cut back. With aeration I would sure watch the fish closely and at any sign of them backing off feed I would cut it back.
But that is just me and I have yet to kill a bunch of fish and as I understand it that is one requirements of becoming an expert which I am not. So it is just my opinion that with lower water you are definitely pushing it a little.
On the other hand in commercial applications they raise CC at multiples of your fish concentration. Was it Dirty Harry that said "are you feeling lucky?"
Here it is:
Do you feel lucky punk? 
