Charlotte is where connections go to die! Unfortunately that's the only option if you want to complete the entire roundtrip in a day. I suppose you could book and if you miss the connection, there are two other flights you could ask to be moved to that would preserve the rest of your trip.

CLT-BNA
AA2945 - 1:00PM-1:31PM
AA864 - 2:30PM-2:50PM

You need to depart BNA at 4PM, so both of those flights would work. Unfortunately inserting either of those into a trip at booking drastically increases the price.