Do all pellet fed bass have small heads and fins? Is this a side affect of pellet feeding? Or do you have to feed so much then it happens? This is news to me, just trying to get more info about it.
If they are fed correctly and there is plenty of pellets ready to eat yes. You would want this "side effect" as it means the bass is young and growing well. The bass is more likely to reach its max potential size. If the fins and head are larger in comparsion the body, the fish is underfed.