I see you're familiar with Ben's Best Guess Chart - great! It sounds like everything's under control and going well - Did I miss something?
I wouldn't use the algecide (and then only polyquat 60%) unless you expect chlorine to drop (like during stain renoval).
The bird donations are pretty gross, that's for sure. Perhaps keep the FC a little higher than the minimum, scoop out and vaccuum what you can see and the chlorine will destroy the microbes.