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Peter, I'm not sure if your Flickr link goes to the correct page as when I look at your picture it seems like it's just a thumbnail of your shot. It's hard to establish the quality from this but the stars appear to be quite round so if that's the case, nearly 4 mins at 500mm focal length is pretty dam good. I can see some of the outer nebulosity appearing and the core is blown out. Maybe reduce your exposure to 120 seconds, increase your ISO to 800 and shoot about 40 or 50 of them. Also expose another 20 or so at 10 to 20 seconds to capture detail in the core. You can process these two exposure values separately in DSS and combine them in Photoshop to produce a dynamic range that reveals the dim and bright areas together that show equal detail.
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