Not sure if this is helpful, but I was playing around with one of these these afternoon using Inovelli's driver. I kept getting an error in my log when running the setColorTemperature() command:
[error] java.lang.NullPointerException: Cannot get property 'level' on null object on line 925 (setColorTemperature)
I was able to make it work in what I think was the expected way by replacing value.level with device.currentValue("level") on the affected line (I don't see a value objected defined anywhere...), though a BasicSet to just turn it on should also work if that works and isn't a bad idea (I seem to recall 700-series certified Z-Wave requirements say something about this?).
Anyway, I guess my takeaway is: check your logs for errors. 
If that doesn't explain it, the other thing I noticed is that Rule Machine's "Set Color" action uses RGBW mode even if you choose "Soft White" (hue 11, saturation 20--not color temperature mode). But it sounds like you're using the "Set Color Temperature" or "Toggle Color Temperature" action, which should use CT mode and--after the above adjustment--did in my testing.
