The city Department of Education ought to be bending over backward to help the best charter schools find space in which to grow and thrive. Instead, the educrats too often do the opposite. Latest case in point: Success Academy Harlem West up on W. 114th St., which shares a building known as M088 with two district-run schools. At full size, if current space allocations don’t budge, Success Academy Harlem West will have 46% of the kids — and claim to just 27% of the rooms.