I have more data to get through and a load of work to do but this longer FL shot went pretty well.
It is an RGB with the trick that the R is a Baader Red Longpass, >610nm. The G and B are Astronomik filters. I was able to keep the gain and exposure down with the greater light grasp of the long pass Red. 60s per G and R (at 71 and 85 fps, respectively) and 80s in blue at 64 fps. Combined in WinJupos, sharpened in Registax 6.
Comments/critiques welcome. I still don't like the edge of the disk which I take to be an issue with WinJupos - perhaps I'm not getting good enough image measurement?