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For my mono RGB imaging, I keep the R-G-B exposures the same, but the luminance (If I shoot it) tends to be shorter. I have always worked on the basis of using a sub length which results in a very small percentage of saturated pixels, to preserve star profiles as best I can, and the luminance filter will hit that point earlier than any other.
The only time I go beyond that would be if I am chasing detail in something really faint, in which case I might end up using an exposure time that results in more heavily saturated stars but then I shoot shorter subs to be able to mask in the brighter stars without the saturation problems.
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