Teachers have rejected a 7.5 percent salary increase offer from the Bolinas-Stinson Union School District, and the two sides are now turning to a state-appointed fact finder in a last-ditch effort to resolve their differences. The district’s non-teaching staff—bus drivers, cooks, custodians and others—accepted a 7.5 percent raise that will bring the minimum wage for current employees to $30 an hour. New classified hires would gradually be bumped up to that level. But teachers, citing…