I agree on the something strange question.
Low bass counts and stunting of the bass do NOT go together.
Sounds like a forage problem to me. (Even if you do have supplemental feeding.)
Did you start the fingerling bass on fathead minnows? Based on the lack of heavy cover (in my view), the minnows are almost certainly 100% gone.
Do you have bluegill or copper-nose bluegill as your main forage base? What are your numbers on THOSE in the survey? Do you sometimes fish for the BG? You should have some large ones by now and lots of size classes. They should also look pretty healthy in a new pond with aeration. They should also boil the water when your feeder goes off?
I am just throwing out some more thoughts for you.
If you can provide some more info, there are some true experts on the forum that can give you some excellent advice. (Surface acres of pond, max. depth, and avg. depth would be simple to provide and add useful info.)
Good luck on your fishery improvements!