Have you ever thougth about hiring a local guide? Can take light years off learning curves.
Also, if you are fishing in IA, then your crappie "season" will follow close suit to mine here in southwest WI. June & July are historically the most difficult stretches to catch crappie. Post spawn feeding windows are gone. The fish have scattered, suspended, and if you ask me, are a little irritated the "fun" spawning season has come to an abrupt hault. This isn't to say they are impossible to catch but feeding windows are short and occur most often during low light conditions (dawn & dusk), which is not to be confused with low visibility conditions. Once the calendar flips August and day light hours begin to shorten considerable leaps the crappie start to school up again for the fall feeding frenzy and become a much easier target in our region.