I have a 0.4 acre pond I stocked a year ago with 200 6� CC , 100 6� HSB, 250 HBG, 50 redear, and 100 coppernose bluegill as well as 10 lbs of FHM.
The bluegill and red ears were small like 2-3�. I think they were big enough the HSB and CC didn�t get them but not sure. I can catch a HSB with ease every time I go out to the pond and have caught many cats as well. So far this year I have only caught two bluegill despite lots of trying with small jigs. I think there are still plenty of them in the pond as something sure loves biting us when we swim but I can�t seem to catch them. It has me concerned about their population as I have heard they are aggressive and easy to catch. I figure with 350 stocked and the coppernose breeding I would have to fight them off the pole.
Redear can be a bit challenging to catch, but HBG and CNBG shouldn't be.
My guess is that you are predator heavy. You have 300 6 inch predators stocked, and 400 small prey fish (in addition to the 10 lbs of FHM which will be eaten by everything).
Usually you want at least ten forage fish for every predator. Some people even go 30 to 1, if really want the predators to grow fast.