Bing, do you practice catch and release with your BG? I wonder if the size of the BOW could impact the equation any? I don't know how large RC's pond is, but my HBG pond is 2/3 acre, and the other three are all between 1/2 and 1 acre in size. I fish these ponds everyday, and I feed once a day in all 4. I can take one or two fish, then nothing....no matter what I throw. I can see the fish, but they show no further interest in my baits.
Throw a handful of AQ500 in there, and it's another story! they will boil the water, but cast into the mix...nothing.
In the early Springtime, shortly after ice-out, they are much more easily caught. I always figured that behavior was driven by hunger, and subsided somewhat once feeding began.