Well, the word that crappie are in your pond is not a good one if your goal is leaning towards a trophy bass pond... It's not the end of the world though!
First, I would keep every single crappie you catch, from a little 2 incher to the biggest one. They are quite tasty so enjoy the fish fries. Your BG and other mixed sunfish should be spawning within the next month or so. All those new YOY fish will be excellent food for those 7" to 8" LMB. It should help their growth rate. All those YOY fish may actually be baby crappie born this year and not baby sunfish from last year, depending on the size. See if you can get a seine around them or toss a cast net over them to find out what they are for sure.
As your sunfish population grows, most of the hybrids should die out of population and you should end up with mostly BG. This will help increase your forage base.
