Also, I'm not sure who you used (nor do I care), but I would DEFINITELY provide feedback for your design team. They, too, want to give you a great product, so if you explain to them why it's not working, they can remember this for next time. Sometimes it deals with timelines, sometimes it's the writer's inexperience, sometimes it's the director not insisting on rewrites or adjustments, sometimes it's none of these things.
Whatever it is at this point, don't be afraid to make adjustments so that they kids march and play well. You shouldn't have to rehearse something over and over again to keep it from tearing...that's a design issue, and with the right set of eyes, one or two adjustments will fix it. I've been with lots of teams, and I will tell you that they make many adjustments on a daily basis all the way up to Area contest.
In any case, when you hire a team to commission the show from scratch, you're paying for that arranger and drill writer's "best first guess." The better ones "guess first" better than the others, which is why they usually cost more.