Once you've read the Thrawn Trilogy, well Zahn also wrote the Hand of Thrawn Duology, ("Specter of the Past" and "Vision of the Future") which deals heavily in politics (the first one) and human relationships (the second) Zahn-style.
After that you have the New Jedi Order Series, by various authors, but I'd just recommend "Vector Prime" by R.A. Salvatore, and "Traitor" by Matthew Stover.
Just for traveling light on summer evenings.
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