You ARE in the NW corner of Indiana!
Instead of stocking another predator, I'd look into reducing some of the underwater weeds to allow the LMB to target more BG. I think the BG have too many places to hide.
If you want a LMB fishery, then I wouldn't stock pike or muskies - they'll target the LMB in a few years.
Do you have any weights/lengths of the LMB that you are catching? Say, a 17" LMB weighs 2 3/4#, etc., etc.