However, Masamichi KOBORI, who succeeded to deceased Masamine as the sixth lord of the domain, had served in the posts including Fushimi bugyo, but was overthrown in 1785, the end of the Tanuma period, because he was cooperative with Okitsugu TANUMA who was influential as Roju (senior councilor).
しかし政峯の死後、後を継いだ第6代藩主の小堀政方は伏見奉行などを歴任し、さらに老中として権勢を振るった田沼意次に対して協力的な態度をとったため、田沼時代も末期の天明5年（1785年）に失脚した。