The best lunker bass lure is the worm. Bassmaster has released a series of books and these stats are not precise, but they took the lunkers caught from their lunker club and used the lures they were caught on. It was like over 80 percent of the lunkers actually caught on the plastic worm.
Really if you are fishing a lake that has little pressure like a farm pond then your bass will pretty much hit anything.
Big topwater baits are great lunker lures. I have read articles of lunkers coming up from twenty feet below to hit a topwater. The zara spook is one of the most renowned lure of choice for topwater.
The large swim baits scored actually pretty low, but that could be them being so new. They are pretty successful on the california lakes, but only expect to get a big bass bite once the whole day depending on the lake you choose.
If you want the lunkers you have to change your tactics and fish only for lunkers, which will also mean the fifty bass you caught will go down to less than five.
One of the bassmaster books is the best way to go since the whole book is about catching the lunker and techniques to use.