Just like in real life, you cant stop AP
Just blitz alot, because you know someone with the Vikes is looking to run no matter what.
Get them into passing situations is your only chance, if he controls you with the run, you lose.
Id run a 3-4 or a 4-6 and blitz depending on where most of the runs are going. The vikes are a really hard team to match up with on D, be sure and run some zone blitzes so you don't get burned when your running man on harvin or berrian.