Some things that might help:
Make sure you have thirty players using all 6 flags (or close to that). Often you will meet a team that is stronger “on paper”, but due to non-participation, is easier to beat.
Agree to put the same color in the “tank” position for all of your players. This may have the effect of having the other team unable to break your tanks in the second half of the war, due to using all of the hard hitters.
Have your stronger players break the tank on a stronger enemy, so that the weaker players can clean up the rest of them.
If an enemy team has an exaggerated number of healers (3 or more), consider not wasting your flag there (or run away before the heal fires off, so that the damage you did counts as points).
You’re going to hit those enemies who have an average score that is about the same as yours, but that still have imbalances that make it hard for your weaker players to score. That’s part of the game… I think I earned like 50 points in the last war (one player cleaned up, one flank broken after someone else hit the tank). We did win the war, though, so one players failure is not automatic doom…