Dynamic Clustering - How many matches do you look for?

Thanks for all the replies, I might implement weighting of points based of distance, something I hadn't considered before.

Voidious: I took a look at WaveSim it looks cool but perhaps im misunderstanding the point, if it is just playing back recorded battles, how can you ever improve your gun against any bots that take into account how often / where you hit them and react accordingly?