Jeff,
Do you not want any LMB at all, or do you just want to maintain the 12 big mommas only?
If you don't want any LMB at all, then I suppose shocking the pond and removing only the LMB would help. The only want to make sure you get EVERY SINGLE LMB out, even in a smaller pond, would probably be to drain the pond or treat the water to kill the fish, and then start over. That's obviously a drastic step, but I don't know how serious you are about getting every single LMB out.
Live bait is the best method if you want to use hook & line. You could probably get most of them if you did it long enough, especially this time of year.
Good luck with the SMB...I wish I could have 'em!
