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Rob,
To save you a bit of time, I just got off the phone to a friend who has an identical filter/camera combination (Astronomik type IIc and KAI-11000 chip). He's performed G2V star tests close to zenith and determine the R:G:B ratios to be close to 1.15:1.0:1.10 respectively. So if R=1 - 1:.85:.95. You can shoot all the same i.e 1:1:1, then colour weight them during the RGB combine.
This of course should only be used as a guide. Some objects will require different colour weights. For example if your framing M45, you'd probably increase the B weighting. Also, optical coatings can affect wavelength transmission resulting in colour weight variations. Finally, leave your B data aquisition until the object is high (70+ degrees) in the sky. The B wavelength (around the 475nm) is seriously affected by atmospheric dispersion far more than R and G wavelengths.
Would still recommend doing your own G2V star tests, but hopefully this will get you up and running quicker.
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