Agree re the core burn out Tj. Needs shorter exps to combine in a Layer mask. Here's a processing walkthrough to try...
http://www.astropix.com/PFA/SAMPLE4A/SAMPLE4A.HTM
Great idea though - it would be very interesting to see how other IISers handle the same data - something for 2009 eh!?
I'll d/load your Tiff for a play around tonight
Doug