More than half of Redwood Trust’s 406 sellers have started offering the company’s “expanded-prime” jumbo product. Company officials said they’re aiming for the Choice product to account for 15.0 percent to 20.0 percent of Redwood’s jumbo volume this year. The firm launched the Choice product in April, allowing mortgages with debt-to-income ratios up to 49.9 percent, loan-to-value ratios up to 90.0 percent or credit scores as low as 661. Choice mortgages tend to have LTV ratios ...