Leaders of the District’s top-performing charter schools told the D.C. Council on Tuesday that they can’t compete with the bonus-laden pay scale of D.C. Public Schools when it comes to attracting and retaining top teachers. The outcry was prompted by a $21.4 million funding bonus Mayor Vincent Gray has proposed for DCPS, with no extra money being allocated for the city’s charter schools, where 40 percent of public school students enroll.