After returning to the Fukuoka Domain, Ekiken bore heavy responsibilities for duties such as giving lectures of Neo-Confucianism, dealing with Korean envoys and solving a territorial dispute with the Saga Domain.
帰藩後、藩内での朱子学の講義や、朝鮮通信使への対応をまかされ、また佐賀藩との境界問題の解決に奔走するなど重責を担った。