It looks to me like the you have got the timing of some of the shots spot on. Its looks like atough gig to shoot and I would be happy with what you have done (camera limitations included)
Regarding the noise I see that you have two options depending on how much this gig is paying you. The first and most expensive is to change your camera body to a model that has better noise factors than your D50, there are many out there but obviously they come at a cost.
The second option would be to try Noiseware Professional instead of neat image. I use this and prefer its features and level of control over those in Neat Image, again the pro version is a pay for product so it is going to impact on your pocket but not as much as a new camera body. There may be a free trial available that you can download to compare its results to your results in Neat Image.
Hope that helps.
One last point...totally off subject - your competition entry has not been accepted as you did not include it with the email (only a link which I couldn't follow) and my reply to your email address bounced. You have about a day to get corrected if you want to be in this months comp
