Never been to VIR myself either, but a corner station located in the center of the turn blocks visibility of the back-side of the turn for incoming traffic. If there is a car spun/stalled center-track on the other side of the corner station, a driver has very little time to react and avoid, even if they see the yellow flag and know there's coming up.
Moving the flag stations to the outside of the turn(s)- close enough to the track to still be easily visible- sounds like a better situation to me.
But again, this is the $0.02 from a guy that's never been there.