From what I'm reading the Vikings have struggled more than normal at OL, whole their LT has still been great, sound like their Center has been giving up a lot of pressures.
Time to unleash the DTs and keep hammering the Center and maybe setting up 5 man rushes to get the Center in one on ones, especially if the Packers are limited at CB due to injuries (Vallentine being doubtful and Alexander being questionable).