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Ken,
Do you know the characteristics of these IR filters? Undoubtedly, the have different transmission and IR wavelength characteristics. I prefer the Astronomical IR filter as it really does cut down star bloating (as Joe mentioned), however this can be remedied in processing techniques - its still best to prevent it occuring in the first place.
IR filters could start at anywhere between 659nm through to 800nm, hence its difficult to make direct comparions. In addition to this they all are likely to have different transmission characteristics ranging from 60% to 95%. If your Astronomical IR filter doesnt have a good transmission rate, then you're going to need to increase exposure time to compensate - this *could* partly be the problem why the colours are off with the Astronomical filter. Finally, you need to also consider spectral response of the Toucam. Its will not be 100% over all visual wavelengths thats for sure.
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