One thing I have found that works is using a virtual bulb with Circadian Daylight as an in-between the app and your real bulbs. Basically, I've run it in two different ways that gets around the brightness issue. In both instances, CD sets the color temperature of a virtual bulb and I do one of the following:
1.) Set up a Hub Variable for color temperature that changes as the virtual bulb changes. Then I use the variable in Room Lighting and other places as necessary.
2.) Use [PRERELEASE] Virtual Prestaging as an in-between the virtual bulb and my real bulbs. I can set Virtual Prestaging to just sync color temperature and ignore brightness.
As I do not know the first thing about coding, I've had to get creative with the brightness bug in CD; otherwise, I love the app!