I am pleased to hear of the quick results you have experienced. I have ignored the LMB in my pond the last few years and I now have only a handful of trophy monsters and a pond full of 8-13 inchers. I started moving out the under 13's the past month too. I hope I see the same results as you.

I cull them with a fly rod, find it easier sight hooking them, also I can avoid the trout hitting the surface fly. One of my 20"+ LMB hit one of the small ones hooked on the fly and gave him quite a ride for almost a full minute before releasing. Usually the big ones gather around the net where I keep the culled fish, they just stare them down. ( I gather 12 at a time and move them to another pond for releasing, easier to keep record total by the dozens).

Mike