The Federal Home Loan Banks may not be the biggest buyers of MBS in the secondary market, but 10 of the 12 government-sponsored enterprises are investing as much as they can under regulatory speed limits. According to data tracked by Inside The GSEs, an affiliated newsletter, the total amount of MBS held in the FHLBank System edged up slightly during the first half of 2005, reaching $116.8 billion after beginning the year with $113.1… [One data table included]