bcraley, thanks for the further information. Water clarity may have had some impact on the growth of your 2019 SMB. They also may not have had ample forage to grow to their potential.
In my experience, I've found that SMB readily take to feed, so it's a bit odd that you only have smaller SMB hitting it. You could consider implementing a larger size feed to help boost some growth rates; this could 'force' a few fish into larger size classes that could change some dynamics in your pond.
