From VHSL Website
Season Information 2017
First Practice July 27, 2017
First Contest Aug. 21-26, 2017
District Deadline Nov. 4, 2017
Playoff Deadline - 1st round Nov. 11, 2017
Playoff Deadline - 2nd round Nov. 18, 2017
Playoff Deadline - 3rd round Nov. 25, 2017
VHSL Semifinals Dec. 2, 2017
VHSL Championships Dec. 9, 2017
I would guess it is up to the individual regions:
My thoughts are Region A is going to have 17 schools, minus Chincoteague is 16. 8 seems fair, 4 leaves a lot out.
Region B has 10 schools, minus appo reg gov school, carver, cumberland, galileo, rapp co. That makes 5 schools playing football. Does 4 work? or maybe they will balance numbers for football.
Region C has 12, I think 6 with top 2 getting bye works.
Region D has 15, I think 8 works.
I think if you go 8 across the board, nobody that should be in would get left out (you would just need to figure Region B out).
4 is too few in my opinion. 6 is going to be good in some years, and you'll leave out 8-2 teams in others. But hey, they'll probably change it again after 4 years again anyways!