Mortgage delinquencies were largely lower in May, according to Standard & Poor’s Ratings Services, in yet more signs that housing-loan woes may have reached a peak. Recent data from numerous sources have shown either plateauing or small declines in delinquencies from the prior month. According to S&P, the under-performer in May was prime-rated jumbo loans, or mortgages of at least $417,000 at origination.