It is in my opinion difficult to have large bass and large crappie in high numbers. Large numbers of small bass are needed to keep crappie numbers down. This encourages less crappie but larger crappie but now you have lots of smaller bass and less food to grow big bass? The other strategy is keep all the crappie and keep small bass? This strategy focuses on increasing forage numbers by reducing predators. Another strategy that has been discussed is trying to use hybrid stripers to control crappie numbers but they are not selective in what they eat. Hybrid strippers do forage along the shore for bluegill and shiners so it's not a magic bullet in only controlling crappie. The strategy I'm using now is focused on reducing crappie numbers. Im leaving bass for now until i can get these crappie numbers down and then will remove bass again. Im also adding hybrids and more forage. I think each year will be different and what you are you trying to accomplish might change