When i bought my property about 3 years ago it had a old pond loaded with GSF. My pond is almost a 1/4 acre. I added 25 LMB about 11/2 years ago. The Bass have all but wiped out the GSF, there are some GSF too big for the bass but that should change soon. My LMB are close to 2lbs.
60lbs of BG seems like a huge anount of panfish but im new to this so i dont really know. Good luck man, have fun!