Freddie Mac continued to put more pressure on its rival government-sponsored enterprise during May, although the two GSEs saw a modest slump in new MBS issuance during the month. Combined production of GSE MBS slipped 1.3 percent from April to May, when Fannie and Freddie issued a total of $68.00 billion of new mortgage securities. Freddie Mac actually posted a modest increase in securitization volume, edging up to $33.65 billion, while Fannie Mae production slipped…