This doesn't totally answer the question about goals against teams with a winning season but here are the statistics of teams of the players listed based on Eurosport. The number of games against teams with a "winning" record and the number of goals the team scored. I assumed scrimmages were not counted in the games/ goals so I just counted the same amount of games the player had listed.
Pickens: 4 games out of the 15 games - 3 goals (team avg. .75)
Christ Church: 4 games of the 10 games listed - 14 goals (team avg. 3.5)
Southside Christian: 7 games/12 - 6 goals (T.A. .86)
Ridge View: 9 /17 - 21 goals (T.A. 2.33)
Myrtle Beach: 4/10 - 14 goals (T.A. 3.5)
Waccamaw: 7/17 - 3 goals (T.A. .428)
Irmo: 7/15 - 19 goals (T.A. 2.7)
Hillcrest: 8/18 - 8 goals (T.A. 1.0)
Brooklyn Cayce: 10/18 - 14 goals (T.A. 1.4)
For reference - games through April 5th excluding scrimages:
Wando: 9/13 games - 22 goals (T.A. 2.4)
Riverside: 10/16 games - 19 goals (T.A. 1.9)
Eastside: 7/15 games - 10 goals (T.A. 1.4)
There are so many variables - 4A down to 1A, a "winning team" schedule strength, injuries, depth of team, etc. So in the end, what does it mean. Nothing unless you can score more than the other team. Isn't there a saying along the line goals wins games, defense wins championships - something like that......??