Thought about this a few weeks back. If I were to go a percentage, I would go Virginia 50, North Carolina 45 and other being 5.
The series is somewhat flexible in teams having two straight home or road games, but Michigan went on the road two straight years (2010 & 2011) and hasn't been "compensated" with two straight home games (doubt it happens). Point being they played at Carolina last year, thus will be home this year.
Carolina and Virginia are due for roadies (but again could play home again). I would normally think Carolina going to Michigan works for symmetry, but in looking at other high end teams, Maryland is slated for home with MSU going on the road.
Maryland hosted UVA in 2014, played at UNC in 2015 but has not hosted the old ACC foe. Thus, getting Virginia at home is too redundant.....which leads back to Michigan.
Virginia at Michigan
North Carolina at Maryland