The other issue with stocking adult LMB is that they are habituated to getting their feed from a certain area in the pond that they grew up in. When they are transferred to a new pond, they don't know where the best areas are at to get feed, and where the best areas are to catch live food. Bob Lusk stocked adult bass in a pond and they actually lost weight. I'd stock all feed trained bass, and stock them at 5"-7" in length or 7"-9" in length. Those fish have been on feed for a year or so, and that should be long enough for them to remember what feed is from year to year. In my experience, non-feed trained bass don't take to feed very well, if I had to put a number on it I'd say only 10% of the non-feed trained bass learn to eat pellets.
Optimal Bluegill and Optimal Bluegill Jr. feed has 9-12 different lengths of feed in the bag, and that was copied by Purina after Purina saw the different sizes of feed in the bag of Optimal feed. Imitation is the best form of flattery.