I had to look up what an MVP Switch card was. Never heard of such a thing. Is there any reason why you need to have it installed? It's my understanding that the switch card exists to change your pci-e lane from 8x to 16x. However, even at 8x, your card isn't saturating the bus, so "forcing" 16x is pointless. Does the board boot up fine without the switch card installed?
If my (limited) understanding is off, plz lemme know.