You can certainly scale it back to 10x. You could also use the 3*RN^2 rule, which would be even lower than the 10x rule. The 3*RN^2 rule will scale relative to the square of the read noise. So if you follow that rule, then there is effectively no real advantage to having lower read noise vs. a camera that has higher read noise...not once you get the same total integration time. Additionally, you will likely find that with this rule that your exposures are extremely short, and that you need more of them than you can handle, unless you are at a really nice dark site.
For RGB imaging, using a lower gain is usually more viable than a higher gain, since you get more DR at lower gain. For the ASI071, it's a 14-bit sensor with very high DR (over 13 stops at minimum gain, IIRC). That is a lot more than even most of the best CCD cameras. So you should not have any problem with DR at a lower gain setting with the ASI071. It's peak read noise is about 3.3e-, which is still quite low. So you shouldn't have problems getting good exposure lengths and minimal if any clipping issues at a lower gain settings. You might need to tweak and fiddle a bit with different rules to find the sweet spot. But there is a sweet spot.
Also, keep in mind that star saturation rate is primarily determined by the aperture of the scope (and secondarily the Q.E. of the sensor and image scale). A larger aperture that is still relatively fast (moderate to faster f-ratio) will have an image scale that allows stars to saturate very quickly. I have this problem with a 150mm aperture at f/4 (1.3"/px). Now, an 80mm f/4, or f/5, or f/6, would have much less problem saturating stars so quickly, since the smaller aperture just isn't going to gather as much light per unit time for each star.
Edited by Jon Rista, 03 May 2017 - 06:51 PM.