There are some good threads talking about wr's, and how to use them to reach your goals. I cull everything under 95%. I use a cheap digital scale from the kitchen department of Big Box Store. For me it makes sense not to cull a smaller fish with good growth. It may be my next lunker! I also tag a few fish every year to get some data on movement and indivual growth. It all goes onto a yearly spread sheet.

Good luck transforming the pond into what you know it can be. Have fun and enjoy your "work".

CMM