Against Wake Forest, Va Tech was a 5.5 point fave and Duke was a 16 point fave
At NC State, Va Tech was a 1 point fave and Duke was an 11.5 point fave
At Miami, Va Tech was a 2 point dog and Duke was a 7 point fave
At North Carolina, Va Tech was an 8 point dog and Duke was a 5.5 point fave
Also, Duke is better ATS than Va Tech so I would give Duke another point or so. The average of line discrepency is around 10.5. Duke is 12 points better than VA Tech on a neutral court. Add in the advantage of Cameron Indoor Stadium, which should be 4-5 points minimum and you get Duke -16 or 17.
Duke (-12.5)