Top mortgage servicers continue to run a stern uphill race against prepayments, even in a market where housing activity and refinance demand are cooling, according to a new Inside MortgageFinance analysis. Fifteen of the top mortgage servicers in the industry saw their combined portfolios grow by some $439.1 billion over the first six months of the year. In addition to bulk servicing acquisitions, these lenders also generated a hefty $1.01 trillion in new originations. That… [One data table included]