How can I catch bigger largemouth bass?

I fish a lot in a bass pond, and normally catch about 10-12 inch largemouth bass. My friend, who fishes in the pond says theres 4ft pike in the pond, and she has pictures of her catching really big bass. She also is curious why im not catching these bigger fish...im using the bait she recommends, which is fake black worms and leeches. I also use spinner baits, and other jigs. Any suggestions on new baits, techniques or areas to fish??? Thanks!!