Sounds pretty good. My first suggestion would be to go from shirt collar to head worn. Two choices for doing that. Either get them into a mesh ball cap or use a head band setup. You can do that by buying a pair of wrap-around headphones (the kind that go around the back of your head) and then removing the actual headphone. Then you just attach your mics to the plastic "wrap around" part. It works REALLY well, and if you have hair that's a little bit long it is almost invisible.
THis will help get the mics higher and away from crowd noise (clapping, singing, etc.).
I hope I was clear enough.
Good luck!
oh, and one thing you could try also is to normalize the recording to 0db using a sound editing program afterward. Some people don't recommend it, but I think it helps a lot.