The top mortgage lenders continued to grow their servicing portfolios by using high-powered production machines and increased bulk purchases in 2005, according to a new analysis by Inside Mortgage Profitability. As a group, the top 30 lender/servicers increased their combined servicing portfolios by $697.4 billion during the first nine months of this year. In fact, these companies accounted nearly all – 99 percent – of the net increase in mortgage debt outstanding over the course…