If this is a cement pond..like our city park ponds, with the bublers/foutians..we are in the same boat so to speak. The only structure is maybe some big ole rocks, and weeds..there are many spots on the pond you can't reach due the size of the pond. Also the water is very shallow, i.e. the very deepest is 5-8' in the middle (out of reach) I have seen 6 to 8 lbr's in one of them.
These ponds are Heavily pressured, so the big girls are smart. I try to throw anything they others aren't, but I too can't seem to hook the big un's..btw, we are way past the spawn. My guess is the girls are resting..you can get the 2-5 lb fish sometimes if you know what to do, fishing in these places is really tough.
Just keep trying, I stick mostly with soft plastic's, but I've thrown everything I own, and then some..lol I'll get me a taod, just a matter of time..