Balance could refer to Yung’s concept of integrating the shadow, being in control of your dark side instead of vice-versa, basically using it for good.
Appreciate these comments, and those by RogueLeader as well. You guys have reminded me of the Star Trek episode in which Kirk gets split into an over-aggressive self and a feeble self. Maybe Force “balance” involves that kind of thing.
In my opinion, though still related to what you two have suggested, the EU had the best Force exploration by far, in the New Jedi Order series.