Welcome - Are you aware of our Common Q&A Archives section? Here is the detailed thread about growing big bluegill.
https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=189988#Post189988esshup also has good info as posted above. BNC might mean black nose crappie? Here they are called BNCP
One option not mentioned is to start over. You being a wildlife biologist you probably have a pesticide license or know an associate with a license to buy rotenone a piscicide - most common one is Prenfish. One gallon in 1/4 ac would eradicate all fish in your small pond so you could start over which would likely provide better results for having big BG. We can provide more advice if needed. A flow through pond would make rotenone use difficult during the wet season with outflow. Outflow year round???
SMB - IMO it is very doubtful that the pond still has smallies in it. After about 4-6yrs the LMB usually crowd out all the SMB when the last SMB died of old age. No SMB recruitment will occur with LMB and SMB together in a small pond. LMB always overpower the smallies.
